Category Archives: Bird Behavior

Identifying Who They Ate

Ringed (banded) racing pigeon in the wild in France (photo from Wikimedia)

15 July 2026

Peregrine falcons eat birds for a living and leave the remains behind, usually just feathers and bones. Every once in a while they eat a banded bird and if we’re lucky the band remains on the gravel at the Pitt peregrine nest. Can we identify who they ate?

Right now there’s a small blue metal band near the green perch that’s been on the gravel for about a year, disappearing and reappearing at random.

Blue band on the gravel, 14 July 2026 (snapshot from the National Aviary Falconcam at Univ of Pittsburgh)

It cannot be read in a closeup but it looks like a homing pigeon band (racing or wedding dove). It’s uncommon for the Pitt peregrines to catch a homing pigeon but I’ve seen it before.

Blue band on the gravel, 14 July 2026 (snapshot from the National Aviary Falconcam at Univ of Pittsburgh)

About 15 years ago during a Pitt peregrine banding, Art McMorris pointed out a homing pigeon band that he’d retrieved from the nest. I volunteered to track down the pigeon’s owner. At the time it was pretty difficult. Each pigeon owner affiliates with a pigeon association and each association has its own band listing. You have to decipher the Association Code before you can begin.

I was having a hard time getting anywhere until it dawned on me that the last 10 digits on the band looked like a phone number. So I called it and immediately reached the pigeon owner in northern Indiana.

He told me that the bird was part of a Young Bird race — hatched 3.5 to 4.5 months earlier — that started in southern Indiana. It should have flown north about 200 miles. Instead it flew northeast about 400 miles — twice as far — before it stopped. It apparently had a compass error so it was totally unsuitable for racing. He did not mind that a peregrine ate it.

At the Center for Conservation Biology they monitor peregrines that nest throughout Virginia including at the James River Bridge at Newport News. Bryan Watts tells the story of prey bands found in peregrine nests. It’s interesting to note that Eastern Shore peregrines eat a lot of shorebirds, some of which have flag bands

Next winter when we clean the falconcams we’ll collect the blue band … if we see it and remember to look.

Pigeons Choose a Door and Win

Pigeon coming in the door (photo from Wikimedia)

13 July 2026

There’s a famous problem that humans get wrong almost all the time but pigeons get right. It’s called the Monty Hall Problem, named after the TV host, co-creator and co-producer of television’s Let’s Make A Deal. It works like this:

There are three closed doors, one with a prize behind it, two with goats. Suppose you and the pigeon both pick Door #1.

illustration for Monty Hall Problem at Wikipedia

You still don’t know where the prize is but Monty Hall does know and he opens one of the two remaining doors that has a goat behind it.

illustration for Monty Hall Problem at Wikipedia

Monty asks you, “Do you want to stay with your choice of Door #1 or do you want to switch?”

Well, it looks like you have a 50-50 chance of winning so you stick with Door #1. This is a losing strategy. Pigeons switch doors and win 2/3 of the time.

Pigeons often perform quite impressively on tasks requiring them to estimate relative probabilities, in some cases eclipsing human performance.” In 2010 scientists spent a month testing 6 pigeons using a similar setup. Within 30 days the pigeons picked the right door 96% of the time. Then they tested 12 humans and the results were lousy.

Pigeons get it. Humans don’t. This video explains how switching doors works best. I see the statistics, but my gut still comes up with the wrong answer.

video embedded from AsapSCIENCE on YouTube

Read Live Science: Pigeons Beat Humans at Solving ‘Monty Hall’ Problem to find out why pigeons are better at this than we are.

Meanwhile this pigeon picks Door #1.

video embedded from Collab Video Archive on YouTube

I Still Don’t Wanna Grow Up!

Yellow at the nest, 6 July 2026, 8:36pm (photo from the National Aviary falconcam at Univ of Pittsburgh)

10 July 2026

On Tuesday morning, 7 July, I was chatting with friends at Schenley Plaza when I heard a young peregrine whining for food — a normal sound in early June when young peregrines have just fledged but atypical in July.

I looked up to see the whiner chasing her parents around the Cathedral of Learning. Yes, it was Yellow. She arrived at the nest the previous evening when her parents were not around.

Right now the Pitt peregrines are mostly off camera but there are occasional moments of excitement. Ecco and Carla bow at the nest. Yellow pops in unexpectedly.

Check the snapshots to see if someone’s on camera. Tune in to the National Aviary falconcam to find out who it is. The falconcam will stay up through the end of July. Show your support at the National Aviary’s Adopt-A-Bird program.

Meanwhile Yellow still doesn’t want to grow up. How long can this go on? Sooner or later she has to leave home.

Is She Going to Interrupt Us? No.

A flurry of peregrines. But who? 30 June 2026, 4:51pm (photos from the snapshot camera)

1 July 2026

This morning when I pulled motion detection photos of the Pitt peregrine nest I found three in a row that didn’t make sense. #1 Ecco on green perch, #2 a flurry of peregrine wings, #3 juvenile peregrine Yellow on the green perch.

Maybe photo #2 was Ecco leaving when Yellow burst in, but there were too many wings in that flurry. Who was it? The video tells the tale.

Ecco and Carla were bowing at the nest to strengthen their pair bond. Heaven knows they have a lot to talk about since two of their kids, Yellow and Green, refuse to leave home.

While they’re bowing we hear a whining juvenile in the background. Carla looks up.

Carla looks up while Yellow is whining, 30 June 2026, 16:51 (photo from the National Aviary falconcam at Univ of Pittsburgh)

“Is she going to interrupt us? No.” (hah!)

video from the National Aviary falconcam at Univ of Pittsburgh

Yellow stayed for 45 minutes but her parents wouldn’t come back until she was gone.

Yellow about to leave the green perch, 30 June 2026, 5:35pm

You’re Supposed to Feed Me!

Green whines at the nest on Friday 26 June 2026 (photo from the National Aviary falconcam at Univ of Pittsburgh)

28 June 2026

On Friday one of this year’s juvenile peregrines burst into the Cathedral of Learning nest and complained loudly that her parents should feed her “Right Now!” though she’s old enough to hunt on her own.

Ecco was in the nestbox, about to bow — maybe Carla was going to join him? — but we’ll never know because “Green” was so demanding that she chased Ecco away.

Green complained bitterly, “You’re supposed to feed me!” But neither parent responded.

Green at the nest on Friday 26 June 2026 (photo from the National Aviary falconcam at Univ of Pittsburgh)

Just like Yellow’s behavior on 23 June, Green was acting half her age. However, unlike Yellow she did not stay at the nest for several hours. She left after seven minutes.

This video shows six of those seven minutes. (I skipped the one minute when she was so far off camera that only her toenails were showing.) Whining. Whining. Whining.

Green at the nest 2026-06-26 (video from the National Aviary falconcam at Univ of Pittsburgh)

With one or more demanding “kids” back at the Cathedral of Learning, Ecco and Carla stayed away from the nest yesterday. They’re avoiding their soon-to-be-independent offspring so the “kids” figure out it’s time to grow up and leave home.

Read about when, where and how the young disperse in this Peregrine FAQ: Where do young peregrines go when they leave home?

Owl Drops By. Whoops!

Great horned owls in Tucson, AZ, Feb 2026 (photo by Mick Thompson from Wikimedia Commons)

19 June 2026

Two great horned owls, youngster and mother, were perched in Tucson, Arizona when Yow! they were nearly hit by a falling owl.

@pachucos_art captured the action on Instagram, playing the fall twice in real time, then in slow motion.

Watch til the end to see the slow motion! I still chuckle every time I watch this, specially because of the mother’s and sibling’s expressions!

from Instagram Reel by pachucos_art (Mario Alexander Flores)

An owl drops by and no one is hurt. He flies up to join his mother at the end of the video.


p.s. The cover photo is a pair of adult great horned owls in Tucson in February 2026, photo from Wikimedia.

Walking Because They Can’t Fly

Canada geese at Southside Riverfront Park, 13 June 2026 (photo by Kate St. John)

15 June 2026

On Saturday at Southside Riverfront Park I found many flight feathers on the ground and fifty Canada geese loafing on shore and in the water.

Molted flight feathers of Canada goose, Southside Riverfront Park, 13 June 2026 (photo by Kate St. John)

Molted flight feathers are the first big clue that these Canada geese are in the midst of their annual synchronous molt.

The second clue is their appearance. When Canada geese have all their primaries we cannot see their white rumps — the primaries cover them. These birds have visible white rumps though the bird on the right still has two lingering flight feathers (turquoise box). They’ll be gone soon.

Canada geese during synchronous molt at Southside Riverfront Park, 13 June 2026 (photo by Kate St. John)

During their flight feather molt from mid-June to August in Pittsburgh, Canada geese make sure they are within walkable range of both food and water. Southside Riverfront Park is the perfect place where they can walk up on shore to eat and run back to the water for safety.

Read more about what is sometimes called a “catastrophic” molt in this vintage article from 2021.

62nd Street Peregrines Came from East Liberty

Female (left) and male (right) peregrines at 62nd Street Bridge, 11 June 2026 (photo by Jeff Cieslak)

13 June 2026

In 2024 and 2025 a pair of peregrines nested successfully at East Liberty Presbyterian’s church steeple where they fledged a total of four young. Nest monitor Adam Knoerzer named them “Libby” and “Dave.”

This March they were on their way to another successful year when a terrific wind storm blew away the sticks that supported the nesting zone. Here’s what it looked like before it disappeared. See more at East Liberty Peregrines’ Nest is Gone.

Former site of East Liberty Presbyterian peregrine nest in April 2025 (photo by Adam Knoerzer)

That was in late March, egg laying season, so Libby had to find a place to nest very quickly. Together the pair looked around for available sites and came up with a plan. They nested at the 62nd Street Bridge.

We didn’t know there were peregrines at 62nd Street until Matt Jacob shared his June 4-5 photos. I wrote about them on 7 June: New Pair Found at 62nd Street. At the end of that article I wondered if this pair had come from East Liberty.

On 11 June Jeff Cieslak visited the bridge and produced the side-by-side photo shown at top.

As Kate StJohn reported last week , a pair of peregrines has appeared at the 62nd Street Bridge. Today, I went to see them, and one was under the bridge on the catwalk not far from Etna. We waited about 45 minutes to see if anything would happen, and at about minute 44 something did. Based on size, the image [at top] shows the female (L) and male (R). The male was actually on the far side of the bridge, but I scaled his image to show the difference.

— description on Facebook at Our Daily Bird by Jeff Cieslak

Adam Knoerzer sent Jeff his photos of Libby and Dave. Jeff put them all together and their face and head features match. Ta Dah! This pair is Libby and Dave.

Libby (left) and Dave (right) peregrines at 62nd Street Bridge, 11 June 2026 (large photos by Jeff Cieslak, inset photos by Adam Knoerzer)

At 62nd Street Libby’s clutch is later than it would have been at the East Liberty because she had to start over. It will be a while — perhaps early July — before we know if they are successful.

This discovery also indicates …

If East Liberty Presbyterian’s steeple (ELPC) has a proper nesting zone, it is a preferable nest site to the 62nd Street Bridge. Peregrines very rarely use the 62nd Street Bridge. This is only the fourth time since monitoring began in 2007.

And yes, it’s possible to identify individual peregrine falcons using photographs. Chad+Chris Saladin have been doing this for years. That’s how they are able to name and re-identify peregrines at various sites in Ohio. See their work at C&C’s Ohio Peregrine Page on Facebook.

On the First Day of Flight

Juvenile peregrine flight practice, Downtown Pittsburgh, 2020-06-28 (photo by Lori Maggio)

12 June 2026

What’s it like to fly — and land — for the first time? While our young peregrines are fledging, so are those at the University of Leeds, UK where @LeedsBirder records their activities with his scope and iPhone.

On 9 June he captured slow motion of a young peregrine (banded ZBJ) flying and landing in the wind on his first day of flight.

Learning to fly is difficult in gusty winds! Not bad for his first day out in the big wide world. @UoLperegrine ZBJ filmed in slow motion at the University of Leeds today. @BBCPaulMurphy @BBCSpringwatch @BBCLookNorth https://t.co/9rzIlFG2Tg pic.twitter.com/8rIRoNCjqm— Leeds Birder (@leedsbirder) June 9, 2026

@leedsbirder video description on X (twitter)
video embedded from @LeedsBirder on Vimeo

See more of his videos, including the Leeds and Bradford peregrines at BlueSky, X or Vimeo.

Peregrine Ingenuity

Peregrine in northeastern Ohio carrying a bat as prey, March 2026 (photo by Chad+Chris Saladin)

29 May 2026

Happy Friday! Peregrine ingenuity at work in Ohio, California, and London (UK).

  • Peregrines capture birds in flight. Bats fly. In the photo above “Gusto” in northeastern Ohio has a bat in his talons.
  • Defend the kids! Diane Wu captured a mother peregrine chasing a brown pelican away from her nest by hitting its enormous beak 5 times!

video embedded from Diane Wu Photography on Facebook

  • Getting up on the wall: This juvenile peregrine struggled to get up on the wall so she used a little wing assist.

(embedded from FAB Peregrines on X)