So far in this blog, I’ve paid a lot of attention to migratory birds and I’ll talk about one this week because we want to see them before they’re gone, right? But I want to periodically focus on the “ordinary” birds, some of whom turn out to be not quite so ordinary!
Thinking of Birds
I thought we’d start this week with a year ’round bird that I’ve taken taken for granted for too many years, The Black-Capped Chickadee (Poecile atricapillus).
Like me, you probably thought this little bird was just another cute face – but we were wrong! At Cornell Ornithology’s website, allaboutbirds.org, I discovered these alert, bright little birds have astonishing capabilities. For example, they hide seeds and other bits of food in separate locations and “can remember thousands of hiding places.” I can’t even find my glasses half the time! Remember how Harry Potter had a “pensieve,” a magical bowl that could strain out unnecessary memories? Well, according to Cornell, every autumn Chickadees literally “allow brain neurons containing old information to die, replacing them with new neurons” so they can adapt to change in the next season!
Chickadees’ calls are described by the Cornell Lab as “complex and language-like,” full of information. For example, you’re probably familiar with this tiny bird’s “Chicka-dee-dee-dee” call. It turns out that the more “dees” you hear, the more dangerous the threat level. Their alarm calls are responded to by many other birds, even those with no similar call. They sleep in individual cavities that they carve out of rotten or soft wood like birch and willow, even without the sturdy beaks of the woodpeckers. Which just goes to show that looks, brains and (a kind of) brawn are part of the package for the tiny puffball we call a Black-Capped Chickadee. Who knew?
Since the breeding season is off and running, you might come across an occasional fledgling near bushes in the park or hopping awkwardly on a boardwalk like this little American Robin (Turdus migratorius). Not to worry. When baby birds get too big for the nest, the parents stay with them and feed them, though you may not see them at the moment. (See our earlier post on “Saving Creatures (seemingly) in Distress.“)[Edit: Thanks to the comment of a knowledgeable reader and local expert birder, I now know that this is a fledgling Wood Thrush!]Many people still think of Robins as harbingers of spring, but they are generally here year round; in cold weather, they roost in trees and eat berries. I’ve seen them in Bear Creek during the winter eating berries covered in ice! In summer, they tend to eat more worms in the morning (which can make them vulnerable to pesticide poisoning) and more fruit or berries in the afternoon. (Cornell Lab says if they eat honeysuckle berries exclusively they can get tipsy!) Males sleep in roosts but females tend to sleep on the nest until the end of the breeding season. Robins can produce three broods per season and they need to because unfortunately less than half the robins in any given year survive to the next year. But a lucky one can live to be 14 years old!
The Eastern Phoebe (Sayornis phoebe) is about to start its second brood. The male, who in the early spring can be heard singing “Fee-bee,” will now care for the first brood, while the female starts freshening up the nest and laying a second set of eggs. They’re not easy to spot now that the male is not singing, but if you see this modest gray bird twitching its tail in a shrub or darting down to the ground to snatch a fresh bit of moss, there’s probably a nest nearby. The Phoebes are migrants who arrive early and stay late, sometimes into October, so you’ve got time.
I have to mention one of the our native ferns (which I love) that has no doubt unfurled on the left side of the Snell Road path into the park just before it opens into the field. It appears to be Ostrich Fern (Matteuccia struthiopteris), a name that pleases me, because although they may be fully open now, when they are unfurling, they remind me of a group of elegant ladies in plumed hats having a confab.
Native vs. Non-Native vs. Invasive?
Speaking of plants, perhaps like me, you’ve heard the terms “Invasive and “Native” plants and thought all plants fell into those two categories. But Ben, Oakland Township’s Stewardship Manager, has taught me to consider one more category. Non-native plants that peacefully coexist with our native ones are simply called “Non-native. ” So I thought I’d start sharing what I’m learning here this week.
“Invasive plants” in our parks are obviously not native to Oakland Township and present problems for our native plants and the creatures that depend on them for food and shelter. They limit the wonderful diversity nature provides for us by either releasing toxins that prevent the growth of native plants, shading them out, or simply taking over large areas of land with their aggressive growth. Let’s consider a beautiful but highly problematical invasive, the Multiflora Rose (Rosa multiflora), blooming now at the southern edge of the small meadow west of the center pond.
Pretty flowers, right? – but super aggressive growth! This rose, originally from Asia, was probably brought here for just that aggressive tendency, to make sturdy fences for livestock, and is still being used some places on divided highways to block light from the opposite side. Its flower is lovely, but then, so is our native pink Pasture Rose (Rosa carolina) which is also blooming right now!
Pasture Roses are hardy. Like many native plants, they are adapted to fire and come back vigorously after a burn. They tolerate drought and resist the usual diseases that afflict cultivated roses – and they smell like a real rose! Long-tongued bees like the Bumblebee (see below) feed on them, as do the caterpillars of a variety of moths. Native birds like the Meadowlark and Bob-White and the Non-native Ring-Necked Pheasant, birds we used to see more commonly in Oakland Township, eat the red rose-hips that develop when the petals fall. In Bear Creek, I’ve only come across Pasture Rose on the path through the Western Woods (not an ideal location for this sun-loving plant), just beyond the bridge at the south end. Perhaps, with the informed restoration that Ben and the Parks Department are doing, this remnant will eventually return to the edges of the meadow where the Multiflora Rose now dominates.
So, what about the category of “Non-native” plants that aren’t invasive? Well, how about everybody’s favorite, which is blooming right now, the Ox-eyed Daisy?
Ox-eyed Daisies (Leucanthemum vulgare) originated in Europe and Asia, so they’re not native, but they aren’t considered invasive here. Their presence usually indicates land that’s been disturbed by human activity; in the old fields of Bear Creek that would simply be farming or perhaps gardening in nearby homes. They aren’t native plants but their presence generally does not disturb or decrease the population of native species, like invasive plants do. In some parts of the country, Daisies can be invasive, but here they peacefully coexist with our native wildflowers.
We’ll come back to exploring these three plant categories as different ones bloom over the summer. But having mentioned the Pasture Rose, the ubiquitous Bumblebee (genus Bombus) , who frequents it, deserves a bit of attention. Here’s one approaching a native Campanula, probably Harebell ( Campanula rotundifolia). Notice its long tongue which it uses to go deep into flowers.
Queen bumblebees hatch in early spring and bluster about looking for an underground burrow in which to nest. They gather pollen, lay their eggs on it, cover them with wax and incubate them – like birds! – for four or five days. When the larvae hatch, they eat the pollen and construct cocoons from which caretaker females emerge to tend the later broods of fertile bumblebees. Only the Queen survives the winter to start the cycle again. Here’s one with the pollen pouches on its legs nicely filled on a Non-native plant, Hairy Vetch (Vicia villosa). Those pollen pouches always remind me of jodpurs.
Edit: For more fascinating details about these essential pollinators, read this beautifully-written article by local wildflower expert, Maryann Whitman.
I’m wondering if this beautiful dragonfly might be spotted in the large marsh on the northeast part of the park near Gunn Road. I’ve only seen this big beauty (about a 2 inch wingspread) when the water is high there , but with all the rain, perhaps it will appear again! It’s called simply the Twelve-spotted Skimmer (Libellula pulchella).
And how about this elegant insect, the Ebony Jewelwing Damselfly (Calopteryx maculata)! The glamorous male should appear now at the back of the big loop in the northern part of the park or in the woods near the large marsh, where the female, modest brown with “smoky wings with white dots near the tips” lays her eggs in the “soft stems of aquatic plants.” Thankfully, someone with a poetic sensibility named this one, with its gauzy black wings and electric blue body. (Quotes from Wikipedia)
And that humble little brown butterfly that appears all over the park in June? That’s the little Wood Satyr (megisto cymela) who loves to bask on tree leaves in the early morning and late afternoon sun.
So despite the rain this year, June rolls on, bringing on many more nectar-drinking butterflies and the flowers they love. Let us know below what intrigues you on your next visit to Bear Creek Nature Park.
*Quick footnote: My sources for information, as well as Oakland Township Stewardship Manager Dr. Ben VanderWeide, are as follows: Stokes Nature Guides: A Guide to Bird Behavior Volumes 1-3, Allaboutbirds.org, the website of the Cornell Ornithology Lab at Cornell University; Wikipedia; http://www.butterfliesandmoths.org; Herbarium of the University of Michigan at michiganflora.net.; various Michigan Field Guides by Stan Tekiela;Butterflies of Michigan Field Guide by Jaret C. Daniels, www.and invaluable wildflower identification from local expert, Maryann Whitman.
9 thoughts on “This Week at Bear Creek: The Chickadee’s Amazing Brain, and What’s the Deal with Non- Native Plants Anyway?”
Thanks for the nice blog and beautiful pictures. I wanted to note that your “robin” fledgling looks like a Wood Thrush fledgling, I believe!
Thanks for the kind words and input, Melanie. Which particular field marks make you think this little one is a Wood Thrush? It could be one because Robins and Wood Thrushes do look very similar, especially when they’re fledlings. I think I’ll send the photo to the local bird expert and see what she thinks. And if she thinks it needs a change, I’ll be happy to edit the piece. Thanks for your comment.
Melanie, thank you! Our local bird wizard, Ruth Glass, confirms that I misidentified that little bird. It was indeed a Wood Thrush. Here’s what she told me.” There are two thrush species that should / may be nesting at Bear Creek, that have orange-ish or chestnut backs – the Wood Thrush and Veery. They share similar forest habitats that must be unfragmented, but the Veery will tend to be closer to the water’s edge and/or wetter environment…The visual difference between the two is the prevalence of spots on the face and breast of the Wood Thrush, the intensity of red on the back of the Wood Thrush, and it’s slightly larger size. So yes, this is a fledgling Wood Thrush.” I really appreciate you correcting me, Melanie. I will do an edit to the piece right now! Thanks again.
Cam, Thanks again for a very informative post. I enjoyed my biology course in high school. You are taking that enjoyment to an entirely new level. Thanks again. Keep the information coming.
The process of doing this blog is doing the same for me – bringing my appreciation of nature to a whole new level. Thanks again for the kind support, Dick.
We had dozens of ebony jewelwing damselflies this year, more than I’ve ever seen before. They seemed to travel in packs. The females didn’t seem to be quite as numerous as the mails. Nice collection of photos and thoughts. Maryann
I’ve never seen Ebony Jewelwings in “packs.” What a sight that would be in the sunlight! Thanks, Maryann.
Chickadees nested in one of my Bluebird houses. Sweet nest- bottom layer was sticks, next layer was moss and top layer was bunny fur! The fledges were darling! At Kensington Metro Park there is a place near their nature center where Chickadees will eat out of your hand!
Thanks, Colleen, for the info. I’ve got to visit Kensington’s Nature Center once I’m up and around again! And next year if you see those fledges, I’d love to camp out for a bit with my camera! Is the nest still there?