Check out this cool bushtit nest. It is attached to some old teasel flower stalks from last year. I have only seen bushtits build nests on trees and shrubs. I am surprised how sturdy these flower stalks still are after enduring a rainy winter and spring. The common teasel is an invasive plant that is native to Europe and temperate Asia. It has swallowed up a sizable area out in the south meadow and is a tough plant to remove from an ecosystem once it has established itself, like what you see at Mt. Pisgah. Anyways, it was cool to see bushtits attaching a nest to old flower stalks. It got me thinking about whether or not there are native plants that could fulfill this role of having old flower stalks being used for building a bird nest on. I like that bushtits are creative and resourceful.
Western Wood-Pewee
For me, the whistling, buzzy pee-wee of the Western Wood-Pewee’s song signals that the warmth and blue skies of summer are here.
Besides establishing territory and attracting a mate, I imagine the song celebrates its miraculous journey and successful arrival at the arboretum. The Western Wood-Pewee is a medium to long-distance migrant that primarily winters in the north and west of South America and travels to North and Central America to breed.
It’s a little, gray bird with a peaked crown that gives its head a triangular shape. It is dapperly dressed in a vest that looks buttoned at the top and has two pale wing bars. The bill is mostly dark with yellow at the base of the lower mandible.
Look for it perched on exposed branches constantly turning its head as it looks for insects. When it spots an insect it will fly out, grab it, and return to the same perch or one nearby. If you listen closely, you can hear the pop of its bill as it snags the insect out of the air. When it lands it will usually flutter its wings slightly as if readying for the next flight. It will eat small insects in midair and bring back larger prey like dragonflies to eat at its perch. I also see them on gravel bars on the river darting around the rocks and gleaning insects.
The nest site is usually at the fork of a horizontal branch. The female builds a compact nest out of small plant fibers and camouflages the outside with lichen, mosses, etc. It is about 3 inches wide and 2.5 inches tall. It can be from near ground level up to 80 feet high! Out at the arboretum, I generally find them at around 20 to 40 feet. As the babies grow up and the nest gets crowded, I get nervous watching them especially if the tree is swaying in the wind.
This is a great bird to get to know. I feel it is very accessible to watch. It will often perch on a lower tree branch near the trail or on old plant stalks.
Nature is an inexhaustible source of wonder. I look forward to seeing you out there.
Resources
Peterson, Roger Tory, et al. Peterson Field Guide to Birds of Western North America. 4th ed, Houghton Mifflin Harcourt, 2010.
Western Wood-Pewee Identification, All About Birds, Cornell Lab of Ornithology. https://www.allaboutbirds.org/guide/Western_Wood-Pewee/id. Accessed 14 June 2023.
Ripe Osoberries
As I walked around the arboretum this week, I have been really surprised to see all of the ripe osoberries. Usually, I am lucky if I can find one that actually ripens enough to eat. When the cedar waxwings show back up at the arboretum, they will descend on these berries and gobble them up before they completely ripen. In years past, it was common to see 3 or 4 cedar waxwings in one osoberry shrub devouring the unripe berries. Also, I usually get lucky enough to see waxwings doing their courtship routine by passing a berry (see blog post: Osoberries Ripening, June 8, 2022), but I haven’t seen many waxwings down in the shrubs so far this year. Maybe they have been there when I haven’t been around. Robins will also eat their fair share too, and I have seen a few robins eating them. I suppose what I am getting at is that there seem to be fewer birds. Maybe there is a more inviting, nutritious food source around that they are eating at the moment. I am not sure. I also saw a chipmunk harvesting them. It was fun to see it pluck one and scurry over to a limb to eat the thin layer of fruit and the seed inside.
Head-scratching Behavior
Quite a few years ago someone gave me a binder they inherited labeled Bird Biology: Seminars from the Laboratory of Ornithology at Cornell University. It is a great resource on the life of birds and a fun read to geek out on. I wanted to share part of it so when you are at your next ornithological cocktail party, you will be able to feel more relaxed and get involved in some nerdy conversations about birds.
“Watch an American Robin on your lawn as it scratches its head. Note that it always passes its leg over a drooped wing, indirectly. All American Robins, as far as we know, scratch their heads in this way. Ovenbirds, on the other hand, always scratch their heads directly by passing the leg in front of the wing. Any behavior that a bird repeats in the same way is stereotyped; any behavior that is the same in all members of a species is species-specific. The indirect head-scratching behavior in the American Robin is stereotyped, species-specific, and probably instinctive.
Because birds no doubt inherit stereotyped, species-specific behaviors, such as the head-scratching behavior in the American Robin, and perform them without preliminary experience or learning, we call them instinctive, or innate. No American Robin learns to scratch its head indirectly; it just does it that way from the first scratch until it dies. Instinctive behavior then is a stereotyped pattern of behavior that the bird inherits. We call these instinctive behavior patterns fixed action patterns.”
Cheers!
Eggshells
In the book What It's Like to Be a Bird: From Flying to Nesting, Eating to Singing--What Birds Are Doing, and Why, David Allen Sibley writes: “If you find a broken eggshell on the ground, the shape of the pieces can give you some information about what happened. If an egg hatches normally, the chick chips away a ring around the widest part of the egg and the egg separates into two halves. The parents then carry the eggshells from the nest and scatter them some distance away. An eggshell cut straight across in this way is likely to be the result of successful hatching nearby. Eggshells in smaller pieces, fragmented or crushed, could be the result of an accident or predation. Given the opportunity, many species of birds and small mammals will eat the contents of an egg and leave the shell behind.”
To me, an eggshell seems like cramped quarters for a baby chick about to hatch out. I am surprised that they take the time and have the ability to chip away a ring around the widest part and cut the egg in half. Amazing!
Cowbird?
On May 21, I wrote about the Brewer’s Blackbird collecting insects by the river. I returned to the gravel bar earlier this week and saw them again collecting insects. This time they were flying over to the nearby willows to feed a begging bird that I could hear but couldn’t quite see. I watched them for a while and the baby bird stayed hidden at the base of willows in the shadows. Eventually, the insatiably hungry juvenile came out to meet the parent foraging nearby, and I got a better look. I thought… Wait a minute, is that a juvenile cowbird? I remembered from my earlier post that Brewer’s Blackbirds will have a clutch size of 3 - 7 eggs. So, should feeding only one bird lead me to be suspicious of cowbird parasitism?
The cowbird egg usually hatches out earlier than the host species. Afterward, they may roll the other eggs out of the nest. Cowbirds will often choose to parasitize smaller birds, so they have the advantage of competing for food with the other baby birds of the host family. They hatched out first, and they are bigger. From what I have read, they can literally starve out the other birds or literally crowd them out of the nest. I looked up juvenile Cowbirds and they look similar to juvenile Brewer’s Blackbirds. Hmm… What do you think? It got me reading and thinking about it more anyways.
Be sure to click on photo to get a better look.
Check out this introductory paragraph from The Cornell Lab of Ornithology Birds of the World: “The Brown-headed Cowbird, North America's best known brood parasite, lays its eggs in the nests of many different species. Originally these ‘Buffalo Birds’ were limited to short-grass plains, where they followed herds of North American Bison (Bison bison) and fed on the insects stirred up by their movement. The Brown-headed Cowbird has since dispersed widely as European settlement in North America opened forests and homogenized the environment into the agricultural and suburban landscapes of today. The expansion of the Brown headed Cowbird has exposed new species and naive populations to brood parasitism, and the pressure on such host populations can be substantial. During the breeding season, female Brown-headed Cowbirds wander widely, overlap the home ranges of other females, and may lay 40 eggs per season.”
Lazuli Bunting
Lazuli Buntings are small finch-like songbirds. Its length is 5.5 inches, which is a pretty small bird. It is smaller than a Western Bluebird (7 in.) and larger than a Lesser Goldfinch (4.5 in). The male is a dazzling blue with a warm orange breast, a white belly, and a prominent white shoulder patch. The female and immature are plain brown with a blue tinge to the wings and tail. They have two buffy wing bars and a pale tan breast. The male perches out in the open while it sings to attract a mate and establish territory. So it is a little easier to see it and capture a photo. The female is a little more challenging to see or photograph because she is usually in a shrub or on the ground.
Peterson describes its habitat as “open brush, grassy hillsides with scattered bushes, riparian shrubs, grassy patches in chaparral, weedy fields and ditches.” The Arboretum has lots of attractive habitats for it. I see them up the creek trail, around the south meadow, and throughout the east side where it is open and shrubby.
To locate this bird, listen for its song and call. Here is Peterson’s description of its voice: “Song a lively, ringing warble, often ending in a quick sputter. Call a sharp spit and a dry buzz.”
All About Birds had this interesting information to think about as you listen to its song: “Just like we each have our own voice, each male Lazuli Bunting sings a unique combination of notes. Yearling males generally arrive on the breeding grounds without a song of their own. Shortly after arriving, they create their own song by rearranging syllables and combining song fragments of several males. The song they put together is theirs for life.”
I love finding a good place to sit and watch this beautiful bird and listen to it sing.
Nature is an inexhaustible source of wonder. I look forward to seeing you out there.
Resources
Lazuli Bunting Overview, All About Birds, Cornell Lab of Ornithology. https://www.allaboutbirds.org/guide/Lazuli_Bunting/overview. Accessed 31 May 2023.
Peterson, Roger Tory, et al. Peterson Field Guide to Birds of Western North America. 4th ed, Houghton Mifflin Harcourt, 2010.
Red-tailed Hawk Eaten?
Walking along the road out to the barn yesterday, I came across some flies buzzing around something on the ground. It was a pile of some guts that had been slightly flattened by one of the arboretum vehicles. I looked up to the limb above it and saw feathers scattered across it. As I begin to scan the ground below the limb, I saw a leg that had been torn off or broken off that had a big yellow foot and black claws. A feather was on the ground nearby. It was a new feather that was still growing out, which indicates that this might have been a juvenile bird.
What happened here? I looked at feathers online and the color of the feet of large birds of prey, and my best guess at the moment is that it is a red-tailed hawk. I don’t really imagine these birds being preyed upon, and they probably aren’t very often. I could see more new feathers on the limb, so this was probably a juvenile still in the nest or perched on a limb nearby. I thought about what bird lives in the arboretum and is big enough to kill a red-tailed hawk. I looked up the diet of a great horned owl on The Cornell Lab’s All About Birds: “They eat mostly mammals and birds—especially rabbits, hares, mice, and American Coots, but also many other species including voles, moles, shrews, rats, gophers, chipmunks, squirrels, woodchucks, marmots, prairie dogs, bats, skunks, house cats, porcupines, ducks, loons, mergansers, grebes, rails, owls, hawks, crows, ravens, doves, and starlings. They supplement their diet with reptiles, insects, fish, invertebrates, and sometimes carrion.” This is quite an impressive list, and as you can see, hawks are on the menu. All About Birds also had this to say: “Although they are usually nocturnal hunters, Great Horned Owls sometimes hunt in broad daylight. After spotting their prey from a perch, they pursue it on the wing over woodland edges, meadows, wetlands, open water, or other habitats.” The nighttime hunting hours are pretty short this time of year, so maybe an owl was out this morning.
Whatever did this, it certainly perked up my awareness. It had the power to tear the leg off! Yipes!
Brewer's Blackbird
Brewer’s blackbirds are collecting copious amounts of mayflies in the shallow water on a partially submerged gravel bar along the river. When they can no longer stuff them in their bills, they fly off across the river and return in mere moments to start gathering another mouthful. Their clutch size is from three to seven, so many begging birds can call out for a meal every time they return to the nest. I watched them for hours, hopping between stones plucking them from crevices or off the top of the water. They are also very adept at swooping up and snatching them out of the air.
The female is a beautiful shale-brown. Her overlapping feathers cascade down her body like deposited mineral-rich silt, which occasionally catches glints of a slightly metallic, greenish sheen on her back. The male is glossy black all over with a starry yellow eye eclipsed by a black pupil. Its body is cloaked in black with iridescent blues on its head turning to greens washing down the back of its body.
I like Peterson’s description of their vocals: “Song a harsh, wheezy, creaking ksh-eee. Call chack.” Sounds like the beginning of a mystery novel: The wind was a harsh, wheezy, creaking “ksh-eee” as it whipped against the weathered wooden boards of the house, straining the nervous, decrepit nails. The loose screen door was bouncing in and out of the jamb with a tiring “chack.” The windows had long been shuttered at the Brewer’s residence since that tragic day.
Warbling Vireo
I love this bird’s soft gaze, and its tranquil, gray body. A sentient being cut from the cloth of a quiet mist drifting through the willows in the cool dawn air. Its song is a warbling stream gently smoothing the surfaces of stones. I reach down into the stream and pick up one. Its fluid rind is soothing and washes over me. It reminds me to take my time and slow down. As I look up, this little bird pops out onto the branch of an osoberry and tugs at my spirit. I follow it to the bank of the river. I sit down, take off my shoes, and put my feet in the water. I splash water on my face and arms. I dig my toes down into the silty shore and squeeze it between my toes.
Nature is an inexhaustible source of wonder. I look forward to seeing you out there.
Golden-crowned Sparrow
The Golden-crowned Sparrow is a fall and winter resident along the Pacific coast and commonly encountered at the arboretum. They migrate north in the spring to nest in Alaska and western Canada.
In the summer during breeding, they have bold markings with a black crown and a bright-yellow forehead that changes to a light gray stripe on top of the head. The immature Golden-crowned Sparrow and the adult winter plumage, the black is brown and the yellow is duller and more subdued.
As I write this post I realize that I am not aware of the song of this bird, mostly I imagine because it probably doesn’t sing very often in its nonbreeding territory. That said, it is spring, and I am hoping that maybe it will start to warm up its vocal cords before it takes off. Peterson describes their vocalizations as: “Song three to five high whistled notes of plaintive minor quality, coming down in scale, oh-dear-me. Sometimes a faint trill. Call a sharp tsew.” Click here to listen on the Audubon website. The recordings are at the bottom of the sidebar on the right side of the first page.
At Mt. Pisgah, I observe them foraging along the edges of paths or meadows where they can easily slip into thickets of shrubs or blackberries for protection. During winter and migration, their diet consists of many kinds of seeds, fruits, grains, buds, flowers, and plant sprouts. They also eat insects like ants, wasps, bees, moths, butterflies, beetles, crane flies, and termites. Interestingly, their diet in summer is not well known but is probably a variety of fruits, seeds, and insects.
All About Bird writes’ “This sparrow is one of the least known of our songbirds, particularly on its northern breeding grounds. It has been the subject of only a few laboratory and field studies, so most of what we know about it comes from scattered notes in scientific journals.” So if you are looking for a way to spend your summer, think about going camping and studying Golden-crowned Sparrows.
Nature is an inexhaustible source of wonder. I look forward to seeing you out there.
Resources
“Golden-Crowned Sparrow.” Audubon, https://www.audubon.org/field-guide/bird/golden-crowned-sparrow. Accessed 30 Apr. 2023.
Golden-Crowned Sparrow Overview, All About Birds, Cornell Lab of Ornithology. https://www.allaboutbirds.org/guide/Golden-crowned_Sparrow/overview. Accessed 30 Apr. 2023.
Peterson, Roger Tory, et al. Peterson Field Guide to Birds of Western North America. 4th ed, Houghton Mifflin Harcourt, 2010.
Black-capped Chickadee
Because small songbirds migrating through an unfamiliar area often associate with chickadee flocks, watching and listening for chickadee flocks during spring and fall can often alert birders to the presence of interesting migrants.
Bushtit Lining Nest
Nature is magical, and one of its most magnificent creatures is the bushtit. Their nest is a woven elegant satchel from earthly ravelings of yarns of mother earth. To line the nest, bushtits wander the landscape collecting tiny feathers—faint notes caught in the rustling music of the wind as it plays through hidden corridors. They are tucked inside their home to cradle the eggs and whisper nurturing songs that infuse them with gentleness and peace. Notes filled with levity will play in their hearts and carry their spirits when they take flight.
Hound's Tongue & Hummingbird
While researching and creating a page in my nature journal for Pacific Hound’s Tongue, I read that this flower is one of the first to bloom in spring and a favorite among hummingbirds. Yesterday in the late afternoon, I was out at the arboretum watching this plant when my friend Patrick walked up. I told him what I just told you and at that moment a hummingbird came up to sip nectar from the flowers! I missed the photo opportunity so I decided to return the next day to try again. I showed up and sat by a small patch of these flowers in front of the visitor’s center. I had only been sitting there 15 minutes when an Anna’s Hummingbird showed up and captured these photos. I sat there for about an hour and half to two hours watching. During that time bumblebees, mason bees, and honeybees all came by looking for nectar. This is a great native plant to add to the landscape around where you live.
Orange-crowned Warbler
This little songbird is olive green with yellow undertail coverts and slight streaking on the breast that looks blurry. They have sharp pointy bills and a thin white or yellow stripe over the eye. There is an orange crown on the head that is seldom seen unless the feathers are raised when the bird is excited or agitated. This bird must have a peaceful spirit. I browsed photos online and didn’t come across any photos of the crown raised. Also, I imagine the orange is fairly subdued and not as bright as a ruby-crowned kinglet, for example.
If you want to see one at the arboretum, look along the river bank. I am seeing them foraging in the willows and osoberries. Their diet consists mainly of invertebrate prey, including ants, beetles, spiders, flies, and caterpillars.
On All About Birds Most it says, “Orange-crowned Warblers nest on the ground, possibly to avoid nest-robbing birds. One exception is the sordida or ‘dusky’ subspecies that breeds on California’s Channel Islands.” I thought this was interesting because I didn’t imagine a warbler that I see flitting through trees and shrubs as nesting on the ground. In Peterson Field Guide to North American Bird Nests it says, “Nest and placement are similar to those of other ground-nesting wood warblers; frequently on shaded woody slopes, hillsides, canyons, or steep banks.”
Peterson describes their voice as: “Song a colorless trill, becoming weaker toward end. Often changes pitch, rising or dropping slightly. Call a sharp stik.” Click here to listen on All About Birds. When you go to listen, you’ll notice that Orange-crowned Warblers are divided into four subspecies. “The one named celata is found in Alaska and across Canada, and it is the dullest and grayest. The Pacific Coast form, lutescens, is the brightest yellow. Found throughout the Rocky Mountains and Great Basin, orestera is intermediate in appearance. The form sordida is the darkest green and is found only on the Channel Islands and locally along the coast of southern California and northern Baja California (All About Birds).”
Resources
McFarland, Casey, et al. Peterson Field Guide to North American Bird Nests. Houghton Mifflin Harcourt, 2021.
Orange-Crowned Warbler Life History, All About Birds, Cornell Lab of Ornithology. https://www.allaboutbirds.org/guide/Orange-crowned_Warbler/lifehistory. Accessed 15 Apr. 2023.
Orange-Crowned Warbler Overview, All About Birds, Cornell Lab of Ornithology. https://www.allaboutbirds.org/guide/Orange-crowned_Warbler/overview. Accessed 15 Apr. 2023.
Peterson, Roger Tory, et al. Peterson Field Guide to Birds of Western North America. 4th ed, Houghton Mifflin Harcourt, 2010.
Chickadees Foraging
To me, chickadees are very aware, curious, and smart birds. Watching them will clue you into many interesting things in nature.
At the moment as the osoberry leaves are continuing to emerge, some of the leaves aren’t unfolding. Some of the leaves are growing and staying tightly wrapped together. Inside this envelope of leaves, there are tiny, white larvae. Somehow, the eggs of this insect have caused the shrub to create this casing of leaves which also has a noticeable fuzziness too.
Chickadees love opening these little packages and they hang and cling to them in all sorts of acrobatic ways. Sometimes the leaf wraps will pop off and the chickadees will carry them over to a branch. Either way, within 10 to 15 seconds, they are able to open them up and extract the larvae.
I have put mesh produce bags around some of the branches to see if I can capture some of these insects as they mature into adults. Since the larvae are all so small, my thinking is that they will develop to maturity fairly quickly. I am hoping that within the next week or so I will see an insect flying around inside the bag.
California Scrub-Jay
The California Scrub-Jay is a magnificent bird that is a year-round resident out at the arboretum.
The upper part of the bird is blue and gray which is contrasted by pale, whitish feathers on its underside. The blue extends off the back of the head and neck onto the sides of the breast creating a scarf or necklace that accentuates its white throat. It has a thin, white eyebrow stripe that sits above a dusky gray that surrounds the eye. The plumage is the same for both sexes.
It is a sizable bird at 11 inches in length which is slightly larger than the American Robin and smaller than the American Crow. As it perches on treetops surveying its surroundings, its long tail becomes apparent.
Its bill is straight and stout, with a hook at the tip that comes in handy for gripping the smooth shell of a nut. I recently watched it collect a cached hazelnut and fly off to eat it.
The California Scrub-Jay likes open habitats, oak woodlands, and chaparral areas. Out at the arboretum, I often see it around the parking lot, the upper part of the creek trail, and the edges of the south meadow.
This bird can be very vocal and is a familiar and recognizable sound to most people. Its voice seems to carry across the landscape as it moves through the treetops defending its territory, warning of predators, expressing the love of its life and home at the arboretum, etc. Peterson describes its voice as: “Rough, rasping kwesh…kwesh. Also a harsh shreck-shreck-shreck-shreck and a rasping zhreek, zhreek.” In contrast to these cacophonous sounds, during courtship or when the pair is close together they sing “a soft medley of sweet notes that can last up to 5 minutes (All About Birds).” Click here to go to All About Birds to listen.
Nature is an inexhaustible source of wonder. I look forward to seeing you out there. Happy Spring!
Resources
California Scrub-Jay Overview, All About Birds, Cornell Lab of Ornithology. https://www.allaboutbirds.org/guide/California_Scrub-Jay/overview. Accessed 29 Mar. 2023.
Curry, Robert L., et al. “California Scrub-Jay (Aphelocoma Californica), Version 1.0.” Birds of the World, 2020. birdsoftheworld.org, https://doi.org/10.2173/bow.cowscj1.01.
Peterson, Roger Tory, et al. Peterson Field Guide to Birds of Western North America. 4th ed, Houghton Mifflin Harcourt, 2010.
