The guys are back in town! Male red-winged blackbirds returned to western Pennsylvania early this month to get a jump on the breeding season. Males arrive 2-4 weeks before the females in order to shake down who owns what territory before the ladies get here.
The best territories are in the middle of a marsh and claiming a good one is extremely important. When the females arrive they chose a mate based in part on the quality of his territory. If the male and his territory are exceptional, up to 15 females join his harem.
According to Birds of the World, experiments have shown that females prefer a harem on good territory to being the lone mate of a male on poor territory. Female red-winged blackbirds would rather be one of many wives than alone with one male in a lousy home. With that in mind the males are getting ready to set up their harems.
Watch for the arrival of female red-winged blackbirds in late March or early April. You’ll hear the boisterous clamor of males when they see the flocks of females.
This 3-minute video shows red-winged blackbird behavior in the spring.
“Tame” ruffed grouse at Moraine State Park, 13 Nov 2020 (photo by Dave Brooke)
13 March 2023
In November 2020 the ruffed grouse pictured above caused a sensation among birders by coming very close to us at Moraine State Park. He even chased my car!
The “tame” ruffed grouse looks at me, Moraine State Park, 13 Nov 2020 (photo by Kate St. John taken on my cellphone)
“Tame” ruffed grouse (Bonasa umbellus) are not common in Pennsylvania but where they occur they are quite noticeable. They aren’t afraid of humans and they sometimes act aggressively. Why do they do this?
The Game Commission is encouraging Pennsylvanians to report the location of any “tame” grouse they see this spring by sending an email to grousecomments@pa.gov. That email should include the person’s name and phone number, date of the sighting, location of the encounter and a description of the grouse’s behavior. Ideally, those sending in a report should also include GPS coordinates for the encounter site.
According to the press release, “The study aims to determine whether the Commonwealth’s grouse population shows signs of splitting up into distinct subpopulations and if “tame” behavior is linked to genetics.”
If you know of a tame grouse in PA please report it.
Meanwhile here’s a video that shows the “tame” grouse behavior.
Egrets and herons are known for standing completely still and waiting for a fish or frog to swim toward them until they stab and grab it from the water.
Reddish egrets (Egretta rufescens) seem manic by comparison, “dancing” so much that they look crazy. Their hunting techniques include:
Foot wiggle
Umbrella wings
Stab the water
Prance and dance
Hover-fly with dragging legs
Watch for these antics below.
This immature bird’s umbrella wings look like a victory pose:
This morning we may be two weeks away from the first Pitt peregrine egg of 2023. Morela’s first egg in 2021 was March 17, last year it was March 18. But who knows? She could be early or late this year.
Yesterday the pair had three bowing sessions at the nest. The first was brief and initiated by Ecco. The second was longer and Morela stuck around to dig the scrape. The third was unusual: Morela spent the entire time on the nestbox roof while Ecco bowed below. Did you see her yell at him from the roof? Check out this photo.
When the pair is not together one of them may be on the green perch, stepping in a sideways sashay. (This sashay video repeats the steps for emphasis.)
While you watch the falconcam get some practice identifying the birds with the two-photo slideshow at top. Notice that Ecco is small, has brighter-white and darker-gray feathers (more contrast), and has bright orange skin on this face and legs. Morela’s feathers are duller with less contrast, she’s bigger, and she has a peachy chest.
It’s spring and our local pigeons (Columba livia) are prancing in courtship. The males bow and coo to their chosen mates and accompany their ladies in flight. When their courtship is successful the males clap their wings.
You can hear cooing and wing clapping in this audio clip …
Nuts seem an unlikely food for blue jays but in fact they make up 67% of their diet in winter. Acorns are their favorites but they also eat beechnuts, chestnuts, hickory nuts and hazelnuts depending on availability.
Jays pluck acorns from the trees in autumn and eat them on site or cache them for later consumption. You would think acorns are too hard for a blue jay to open but Birds of the World (Cyanocitta cristata) explains how they do it:
Hard foods such as acorns, dry dog food, eggs, etc., are rendered by holding them against a branch or other substrate with one (usually) or both feet, and hammering with the mandible.
To cache the nuts — as much as 2.5 miles away — blue jays stuff their faces. The blue jay at top is carrying two acorns in his throat and one in his beak. The blue jay below is going overboard with peanuts. When they reach their cache sites they dump the nuts in a pile and bury them individually.
If they don’t retrieve all of them, no problem. The acorns germinate and become new trees. Studies have shown that “This tendency may account for the rapid post-glacial dispersal of oaks indicated by pollen analysis,” according to Birds of the World. With this in mind, the Agassiz Audubon Society in Minnesota enlisted the help of blue jays ten years ago to “plant” oaks after volunteers collected and dispersed thousands of native acorns in an area that needed new trees.
To retrieve their cached food, blue jays dig it up with their beaks but this doesn’t work when the ground is frozen. It’s just one more reason why blue jays migrate south for the winter.
If your neighborhood doesn’t have any blue jays right now, it may be because they migrated. But check out the local trees. If there aren’t any oaks or nut trees in your neighborhood that may explain why you haven’t seen any blue jays lately.
This vintage article still gets a lot of comments because people miss seeing blue jays.
Evidence of flowerpiercer on a passionflower (Passiflora sp.), Yanacocha, 30 Jan 2023 (photo by Kate St. John)
11 February 2023
On our first day in Ecuador, 30 Jan 2023, we traveled to Yanacocha Biological Reserve 11,500 feet up on the Pichincha Volcano. We were wowed by the huge passionflowers (Passiflora sp.) dangling from vines along the trail but on close examination found a hole in this flower tube. It was made by a bird.
Passionflowers hanging from the vine, Yanacocha, 30 Jan 2023 (photo by Kate St. John)The face of the same passionflower pictured at top, Yanacocha, 30 Jan 2023 (photo by Kate St. John)
These passionflowers evolved long tubes in an arms race against hummingbirds who developed ever-longer beaks to reach the nectar. However members of the Tanager family eat nectar, too, even though that have short beaks and cannot hover at the flower opening. Flowerpiercers (Diglossa sp.) land on the flower and bypass the flower’s defenses by poking a hole in the tube.
Masked flowerpiercer, Yanacocha, 30 Jan 2023 (photo by Mary Eyman)
Masked flowerpiercers (Diglossa cyanea) and glossy flowerpiercers (Diglossa lafresnayii) were abundant at Yanacocha. We could hear them chattering in the forest …
… and see them at the nectar dishes. (The glossy flowerpiercer is black with a white shoulder at left below.)
Glossy (black at left) and masked flowerpiercers (blue), Yanacocha, 30 Jan 2023 (photo by Kate St. John)
Flowerpiercers are specially equipped for piercing flowers with a hook at the tip of their beaks. This photo from Wikimedia Commons shows the hooked tip.
In Pennsylvania it’s the hummingbirds that eat nectar and insects that make holes in flowers. It’s amazing to think there is so much nectar in Ecuador that birds bother to pierce the flowers.
(photos by Kate St. John, Mary Eyman and Wikimedia Commons)
Red-tailed hawk casting a pellet, 2018 (photo by Chad+Chris Saladin)
22 January 2023
This red-tailed hawk is not consuming the lump near his mouth. He’s casting a pellet of indigestible bones, fur and feathers that came up from his gizzard. Pellets are a normal by-product of digestion in birds of prey. If you find one, it can tell you what the bird was eating.
We always find pellets during annual maintenance at the Pitt peregrine nestbox including these three found during our 9 January visit (paperclip for scale). The pellets can be many months old.
Peregrine pellets from Cathedral of Learning nestbox, 9 Jan 2023 (photo by Kate St. John)
A closeup shows feathers and bones (no fur*) but is not very enlightening due to the pellet’s age. Fortunately I stored the pellets in a ziploc bag. After they thawed a small fly appeared inside the bag, hatched from eggs laid on the pellet in much warmer weather. Ewww!
Closeup of peregrine pellet (photo by Kate St. John)
Morela casting a pellet, 17 Dec 2021 (photo from the National Aviary snapshot camera at Univ of Pittsburgh)
Peregrine pellets are slightly longer than a paperclip. Some birds make much larger pellets.
On a hike at Audubon Greenway Conservation Area last Wednesday we found a surprisingly large pellet containing fur, bones and a big tooth. It was so large that we wondered if a bird could produce it. I didn’t pick it up but it looked as though it could span my palm.
Pellet found at Audubon Greenway, 18 Jan 2023 (photo by Kate St. John)Alternate view of pellet found at Audubon Greenway, 18 Jan 2023 (photo by Kate St. John)
Golden-winged warblers (Vermivora chrysoptera) and blue-winged warblers (Vermivora cyanoptera) do not look or sound alike but they are well known to hybridize. Because of this ornithologists used to worried that the more numerous blue-winged warbler would force the golden-winged out of existence. Then a 2016 genetic study showed no need to worry — they are very closely related. Now a 2022 study shows that hybridization will become less likely thanks to climate change.
In 2016 we learned that golden-winged and blue-winged warblers are virtually the same bird — 99.97% genetically alike! No wonder they interbreed.
Put another way, the striking visual differences between Golden- and Blue-winged warblers could be considered akin to the differences between humans with and without freckles. Golden-wings and blue-wings have even less genetic differentiation than two subspecies of the Swainson’s Thrush.
Their colors and songs fooled us so we called them hybrids and even named them Brewster’s and Lawrence’s warblers, but the difference is moot to the birds themselves. This illustration embedded from All About Birds, shows their four color phases governed by a dominant/recessive throat-color gene.
Historically (1932-1997) the warblers’ ranges overlapped a lot but by 2012-2021 it was evident they were moving apart. Climate change has moved the golden-wing’s preferred cooler habitat to the north and higher elevations.
The future will move their ranges even more, shown in six scenarios below. The left column shows climate altering emissions peaking in 2040 and then declining. The right column shows emissions continuing to rise through 2100.
Unfortunately climate change may force one or both warblers out of existence. Map (d) is the only happy one for both of them but they will disappear as breeding birds in western Pennsylvania.
Don’t worry about golden-winged warbler hybrids. The real problem is climate change.
