Category Archives: Crows & Ravens

Thousands Of Crows In Oakland

Crows burst off a building as they prepare to roost in Oakland, 4 Nov 2016 (photo by Kate St.John)
Crows burst off a building as they prepare to roost in Oakland, 4 Nov 2016 (photo by Kate St.John)

Ever since the winter crows came back to Oakland I’ve wanted to watch them arrive at the roost so last Friday evening, November 4, I stopped by Schenley Farms and Pitt’s campus.  What a spectacle!

Half an hour before sunset a steady stream of silent crows flew in from the southwest to the hill above Bigelow Boulevard near Centre Avenue.  I assumed they would spend the night up there, but no!

Crows are afraid of great horned owls — for good reason — so they want a good view from the roost. They prefer the tops of tall well lit trees or rooftops five to ten stories high. And they want no owls nearby.  Perhaps that’s why they like cities.

The sky was clear on Friday evening and the light lingered long after sunset at 6:13pm so my camera could “see” them against the sky.  Before it was dark nearly 40 crows chose this bare tree. The tree isn’t full yet.

Crows assemble in the treetops (photo by Kate St.John)
Crows assemble in the treetops, 4 Nov 2016 (photo by Kate St.John)

As darkness fell they left the hilltop for the area bounded by Fifth, Bayard, Bellefield and Tennyson.  And now they were loud!  Hundreds flew above me on Bayard Street.

Hundreds of crows above Bayard (photo by Kate St. John)
Hundreds of crows above Bayard (photo by Kate St. John)

 

They assembled at the roof edges of tall apartment buildings and then burst off to choose another site (photo at top).  They landed on Alumni Hall and packed in tightly on the Wyndham Hotel roof.

As night falls some crows choose Alumni Hall rooftop for their roost (photo by Kate St. John)
As night falls, some crows choose Alumni Hall’s roof (photo by Kate St. John)

… and they settled in the treetops on campus, 100 to 200 per tree.

Crows settle on the treetops on Pitt's campus, 4 Nov 2016 (photo by Kate St. John)
Others settle in the treetops on Pitt’s campus at Fifth Ave, 4 Nov 2016 (photo by Kate St. John)

 

I calculated 4,000 crows in that four block area, but they were still arriving after it was too dark to see.  I have no idea how many spent the night there.

Until today most people didn’t notice the crows because rush hour was over by 6:00pm.  But today we’ve changed the clocks back and rush hour will be at sunset, 5:09pm.

People will be surprised by the spectacle — and some will be repulsed — that there are thousands of crows in Oakland.

 

(photos by Kate St. John)

They’re Back!!

American crows saunter on the driveway (photo by Marcy Cunkelman)
American crows saunter on the driveway (photo by Marcy Cunkelman)

1 November 2016

The crows are back in town! On Halloween evening they made such a huge scene in Oakland that I’ve preempted my scheduled blog for this breaking news.

Christina Schmidlapp reports,

Oh, they are back!  They’ve been massing around trees in Schenley Farms for about a week, though I think they only settled here for a night or two along Bigelow Blvd. between Schenley High School and Bayard.  They make stops on the tops of the Madison Apartments on Bellefield and also an apartment building on Dithridge en route to even higher ground.  I can watch their flight trajectory at the end of the day from the east into the Hill district. Almost nonstop for quite awhile.

And Dr. Tony Bledsoe wrote:

A student sent me a video of American crows assembling to roost around the Clapp/Langley/Crawford complex earlier tonight [Halloween].  I estimate, inferring from some in the background, at least 1,000.  That’s probably conservative.

Crows love to spend the winter in Pittsburgh because it’s 5-10 degrees warmer than the countryside, our night sky glows with light, and food is everywhere if you aren’t picky (garbage dumps in the suburbs and dumpsters in town).

The flock is settling in and retaking the streets.  Here’s their South Side Story to the tune of When You’re A Jet, a throwback to November 2009:

 

(photo by Marcy Cunkelman)

The Blue Jay’s Many Sounds

video embedded from Lesley the Bird Nerd on YouTube

20 May 2016

Blue jays are making interesting sounds and gestures lately but what do they mean?

In the spring I often hear blue jays say “tweedle” and, on rare occasions, I see one bounce and gurgle.

Tweedle? Gurgle?  Lesley the Bird Nerd explains it all in this video.

p.s. Only females make the “Rattle” call.

(video by Lesley the Bird Nerd on YouTube)

Ravens Dance?

Lots of birds puff their head feathers and stand erect to show their dominance.  Common ravens do it, too.

When Zachary Cava filmed three ravens interacting in the Mojave Desert he thought they might be courting.  Was this courtship or was something very different going on?

Cornell’s Birds of North America explains that among common ravens,

The highest level of dominance is displayed by slowly walking highly erect with bill pointed upward, fluffing out throat hackles and [fluffing] feather tracts above legs to create “pant”-like appearance, elevating “ear” tufts, and flashing white nictitating membranes. Wings are spread slightly at the shoulders. Both males and females engage in this behavior, but it is more pronounced in males.  (credit: Bernd Heinrich)

Yes, these two ravens are working out who’s in charge.  So why is the third one bowing low with his head puffed up?

His actions resemble the male’s pair bond display to the female(*) but he’s got his back to the other two and they aren’t paying much attention.

Ravens don’t dance … or do they?

(video from YouTube by Zachary Cava)

(*) “In direct display to female, also fluffs out head, bows to female while spreading wings and tail, flashes white nictitating membranes, makes gurgling or choking sounds, and snaps bill.”  — credit Cornell Birds of North America

Peregrines Claim The Bridge … Maybe

Ravens & Peregrine Falcons 1
(video by Gina M. Rubino)

Peregrine falcons and common ravens have a long history of nesting near each other. Both favor cliff ledges with similar qualities and will nest 100-200 meters apart (1-2 football fields).  They’ll even take over each others’ unused nest sites, but they don’t get along.

Peregrines harass ravens though they rarely hurt them.  Ravens are big and powerful and very acrobatic in flight.

Since 2007 a peregrine pair has nested over the Ohio River on one of two bridges: the Monaca-East Rochester Bridge (Rt. 51), or the enormous Monaca-Beaver railroad bridge.  In 2015 they nested on the east tower of the railroad bridge (Monaca side) and fledged two young.

Ravens are rare in Pennsylvania’s urban areas but they do nest on railroad bridges, laying their eggs in late February a month before the peregrines nest.

Last Friday, February 12, Gina Rubino was watching a raven build a nest on the west arch (Beaver side) of the Monaca-Beaver railroad bridge when two peregrines showed up.  She recorded three videos.  Above, a raven builds the nest on the near arch, then perches on top of the arch and takes shelter when a peregrine zooms past.

Below, two peregrines harass the raven who again takes shelter in the bridge structure. This double-teaming is typical of peregrine-raven interactions.

Ravens & Peregrine Falcons 2
(video by Gina M. Rubino)

Eventually, the raven pair gets the message and flies off together while a peregrine perches on the far (east) end of the bridge.

Ravens & Peregrine Falcons 3
(video by Gina M. Rubino)

Do the peregrines want the railroad bridge for their own nest this year? Or are they just annoyed by the ravens, as peregrines often are?

Gina wrote on PABIRDS, “I’m hoping the two groups can settle their differences (I would love to see both successfully nest), but I have my doubts…”

Me, too.

(videos by Gina M. Rubino via Flickr)

Capitalism Benefits Brainy Birds?

American Crow with peanut (photo from Shutterstock by Al Mueller)
American crow with peanut (photo from Shutterstock by Al Mueller)

On Throw Back Thursday:

A 17-year bird study that bridged the end of Communism and the start of capitalism in East Germany and Czechoslovakia showed the mix of species changed. Birds with small brains declined. Birds with big brains thrived.

Does capitalism benefit brainy birds? Click here to find out.

 

(photo from Shutterstock by Al Mueller)

Whose Voice Is That?

17 January 2016

Blue jays mimic the sounds of raptors to warn or fool(!) other blue jays.

In Pittsburgh they often mimic red-tailed hawks.  In Florida they mimic the red-shouldered hawks that are louder and much more common.

This video from MyBackyardBirding in Florida is a good example of how blue jays can sound like hawks.  Can you tell who’s who when they aren’t on screen?

The mourning dove seems to be having a hard time figuring it out.

(video from MyBackyardBirding on YouTube)