Archive for the 'Birds of Prey' Category

Mar 13 2016

Falcons and Eagles: A Nestcam Round-up

Louie explores the nest area while Dori perches above at the Gulf Tower (photo from the National Aviary falconcam)

Louie explores the nest area on 10 March 2016 while Dori perches above (photo from the National Aviary falconcam at the Gulf Tower)

Raptor nesting season is already upon us.  Bald eagles have eggs.  Peregrine falcons will lay them soon.  Here are some opportunities to watch their nests from the comfort of your home.

  • Peregrine Falcon Cams:
    • Cathedral of Learning, University of Pittsburgh: My all-time favorite webcam shows Hope and E2 as they prepare to nest together for the first time.  Watch for eggs this month.
    • Gulf Tower, Downtown Pittsburgh: Dori and Louie, shown above, are spending time at the Gulf Tower this spring after nesting at non-camera sites for a few years.  Will they nest at Gulf this year? The real litmus test will be when Dori lays eggs, mid-March to early April. (*)
    • Times Square Building, Rochester New York: The female at Rochester’s Times Square has a Pittsburgh connection.  Beauty was born at the Cathedral of Learning in 2007. She’s Dorothy and Erie’s daughter.
    • Wilmington, Delaware: Red Girl at Wilmington is one of the first peregrines to lay eggs in the Mid-Atlantic. She already has four, laid March 5 through 10.
    • Harrisburg, Pennsylvania Falconcam: Another early nester, the female in Harrisburg began laying eggs on March 7.
  • Bald Eagle Cams:
    • Pittsburgh’s Hays and Harmar bald eagles:  Two nests on one convenient web page at  The Hays female laid her eggs on February 13, 16 and 20 so her first hatch will be (approx) March 19.  Harmar’s first egg was March 9 so watch for hatching on (approx) April 13.
    • Decorah, Iowa:  Decorah is one of the longest running eagles cams in the U.S.
    • Check the Eagleholic Eagle Cam list for a list of webcams complete with egg dates.  Pittsburgh’s two nests are listed as “Pittsburgh Hays” and “Harmar”.
  • Watch great horned owls, barred owls, red-tailed hawks and others at Cornell Lab of Ornithology’s Bird Cam page.

This list is just a sampling.  If you have a favorite nestcam post it in Comments below.


(*) Keep in mind that the cameras show only a small piece of these birds’ lives.  You must visit their territories and observe them in person to see what’s really going on.  Case in point: Click here for two comments (read the question and answer) about yesterday’s lack of activity at the Gulf Tower.

(photo from the National Aviary falconcam at the Gulf Tower)

10 responses so far

Feb 21 2016

Three Eggs at the Hays Eagle Nest

Third bald eagle egg at Hays

Since yesterday afternoon at about 2pm there are now three eggs at the Hays bald eagle nest in the City of Pittsburgh.

In backwards order, the egg above is the 3rd one (February 20). The video below is the second one, laid on February 16. Click here for the first one on February 13.

Second bald eagle egg at Hays

There are still no eggs at Pittsburgh’s other webcam eagle nest at Harmar, but by the time you read this it may have changed.

As always, watch the Hays and Harmar eaglecams on the Audubon Society of Western Pennsylvania website at   Read more on their Facebook page.

(videos of the Hays bald eagle near in Pittsburgh, PA from PixController’s Facebook page)

No responses yet

Feb 19 2016

Celebrity Vultures In Peru


What does a city do when it’s overwhelmed by illegal garbage dumps?

In Lima, Peru much of the trash generated by its 10 million people is dumped illegally but it’s hard to clean up because the dumps are hidden and people don’t care.  In December 2015 the Peru Ministry of Environment enlisted the help of birds.

Black vultures (Coragyps atratus) are excellent at finding garbage — after all, their lives depend on it — so the program equipped 10 black vultures with GPS trackers and GoPro cameras and Ta dah!  The vultures find the dumps. The humans place the dumps on the map and clean them up.  And the vultures have become celebrities.

See the maps at Gallinazo Avisa.  Meet the vultures — they have names — in their second video here.  (Don’t miss the punchline at the end of the video!)

Read more about Peru’s “Vultures Warn” program at


(video from Gallinazo Avisa at YouTube)

No responses yet

Feb 14 2016

First Eagle Egg At Hays, Feb. 13

Perhaps you’ve already heard the happy news …

(Pittsburgh, PA – February 13, 2016) It’s not yet Valentine’s Day, but love is in the air at the Hays Bald Eagle nest. This morning, Audubon Society of Western Pennsylvania confirmed that the Hays eagles have one egg in the nest. The egg was laid overnight, when the Bald Eagle web camera was turned off. The egg was noticed at 7:30 am when the cam came back up, clearly showing one of the eagles sitting on an egg.

Watch two Pittsburgh-area bald eagle nests — both Hays and Harmar — on the Audubon Society of Western Pennsylvania website at   Read more on their Facebook page.

Happy Valentine’s Day!


p.s. This egg was laid four days earlier than her first egg in 2015.

(video from the Hays Eaglecam via PixController’s Facebook page)

No responses yet

Feb 02 2016

Drinking Blood?

Yellow-headed caracara on a cow in Venezuela (photo from Wikimedia Commons)

Yellow-headed caracara on a cow in Venezuela (photo from Wikimedia Commons)

When I wrote that yellow-headed caracaras pick ticks off of mammals Dr. Tony Bledsoe pointed out that, based on the similar behavior of an African bird, it’s possible the caracaras are also drinking the animals’ blood.

Ewww!  What gives?

In Africa, there are birds called oxpeckers (two species in genus Buphagus: yellow-billed and red-billed) that also perch on mammals and eat ticks, lice, fleas, and biting flies found on the animals’ skin.  Studies have shown that individual oxpeckers eat up to 100 engorged ticks or 13,000 nymphs per day.  Quite a benefit to the animal!

Yellow-billed oxpecker on a large bovine mammal in Africa (photo from Wikimedia Commons)

Yellow-billed oxpecker on a large bovine mammal in Africa (photo from Wikimedia Commons)

Engorged ticks contain tiny blood meals so it’s not a big leap that the oxpeckers sometimes to go directly to the blood source, pecking and plucking at an animal’s wounds.  Despite this parasitic and perhaps painful behavior, many mammals tolerate the oxpeckers although elephants and some antelopes shoo them off when they land.

Yellow-headed caracaras are unrelated to oxpeckers but their tick-eating behavior extends to blood meals as well. The Handbook of the Birds of the World includes this remark about the caracara’s eating habits:

“Perches on cattle and Capybaras (Hydrochoerus hydrochaeris) to pick off ticks; picks flesh from open wounds on backs of cattle, which often seem oddly indifferent to the process.”

It sounds gruesome but the benefits of having your own portable tick-remover apparently outweigh the occasional blood meal.


(photos from Wikimedia Commons. Click on the images to see the original)

No responses yet

Jan 31 2016

Near Open Water

Published by under Birds of Prey

Eastern screech-owl near Loyalhanna Dam, 28 Jan 2016 (photo by Anthony Bruno)

Eastern screech-owl near Loyalhanna Dam, 28 Jan 2016 (photo by Anthony Bruno)

Often the best birds are near open water, even if they don’t eat fish.

Anthony Bruno found these two at Loyalhanna Dam on January 27 and 28 — an eastern screech-owl (who doesn’t eat fish) and an immature bald eagle (who does).

Immature bald eagle, Loyalhanna Dam, 27 Jan 2016 (photo by Anthony Bruno)

Immature bald eagle, Loyalhanna Dam, 27 Jan 2016 (photo by Anthony Bruno)


As we head into February, birds are harder to find in western Pennsylvania.  It’s the low ebb of our birding year.

Check out the places with open water and you’ll have better luck.

Look closely.  They may be camouflaged.


(photos by Anthony Bruno)

p.s. I went to Loyalhanna Dam today and saw 5 bald eagles but I missed the eastern screech-owl.

4 responses so far

Jan 29 2016

How To Raid A Wasps’ Nest

There’s a bird of prey in South America that likes to raid wasp nests to eat the larvae.  The problem is that red-throated caracaras (Ibycter americanus) have bare skin on their faces and throats, an easy target for stinging wasps.

How do the birds get the larvae without a lot of pain?  Do they chemically repel the wasps?

In 2013, Canadian Sean McCann and colleagues studied red-throated caracaras in French Guiana on the north coast of South America.  They learned that, no, the birds don’t repel the wasps.  The caracaras are attacked but they compensate in other ways.

Watch the video to see how the birds nab their tasty meal.  They know something about wasp behavior that we had been ignoring.

Click here to read more in their PLOS ONE paper, Strike Fast, Strike Hard, or here at

(video from YouTube)

No responses yet

Jan 27 2016

Eagle Season Starts With A Bang!

Harmar Bald Eagle carrying nesting material, March 2013 (photo by Steve Gosser)

Harmar bald eagle carrying nesting material in March 2013 (photo by Steve Gosser)

For one of Pittsburgh’s three bald eagle pairs, this year started off with a bang.

Since late 2013 the Harmar pair that nests along the Allegheny River have been hard to observe because PennDOT blocked off the nearest viewing area while building a replacement for the 107-year-old Hulton Bridge.  Steve Gosser took the photo above from that viewing location in March 2013. It’s been hard to get good photos for years.

Last October the new bridge was completed and dedicated but the eagle viewing area was still closed while PennDOT began to deconstruct the old bridge.  However …

Yesterday morning, in a flash of light and sound, the old Hulton Bridge was imploded into the river.  Here’s a video from Dave DiCello, posted at The Hulton Bridge Blog on Facebook. (Dave also filmed the Greenfield Bridge implosion last month.)


Staff from the Audubon Society of Western Pennsylvania were on hand to monitor the eagles just in case.  As ASWP reports below, the eagles weren’t affected at all. They were 3.4 miles away as the crow flies.  (The eagles would have flown along the river, which is even longer.)

The Harmar eagles were down river near the Fox Chapel Yacht Club at the time. Our staff member monitoring the eagles said that the birds “didn’t even flinch” at the sound of the implosion.

The eagle viewing zone at Harmar will be closed a while longer but you can watch this pair easily now on the Audubon Society of Western Pennsylvania website.  ASWP has both the Hays and Harmar eagles’ nests streaming live at Click here to watch.

And for more images of the Hulton Bridge coming down, check out The Hulton Bridge Blog on Facebook and this story with videos at KDKA.


(photo of Harmar female eagle, March 2013, by Steve Gosser. Video by Dave DiCello)

5 responses so far

Jan 21 2016

Lead Poisoning Kills Birds

Published by under Birds of Prey

Bald Eagle in rehab for lead poisoning at Medina Raptor Center, Medina, OH (photo by Debbie Parker)

Bald Eagle in rehab for lead poisoning, Medina Raptor Center, Medina, OH, January 2009 (photo by Debbie Parker)

On Throw Back Thursday:

The news from Flint, Michigan about lead in their water supply reminds me that I wrote about lead poisoning in birds back in 2009.  Sadly not much has changed.

Though the U.S. has banned lead shot in wetlands, it’s still present in fishing sinkers and the bullets used in deer hunting.  Scavenging birds, including bald eagles, eat the gut piles hunters leave behind and are poisoned by the bullet fragments.  Many die.

A 2012 bald eagle mortality study in the Upper Mississippi Valley found that 60% of the dead eagles had detectable concentrations of lead in their livers. 38% had lethal levels.

In 2012 USFW researchers examined 58 dead bald eagles and identified lead exposure as a significant mortality factor (photo from USFW)

In 2012, researchers examined 58 dead bald eagles and identified lead exposure as a significant mortality factor (photo from U.S. Fish and Wildlife, Midwest Region)

Sadly, the problem is seen too often by veterinarians and wildlife rehabilitators.

Back in January 2009 I wrote about the dangers of lead poisoning and the sick eagle, pictured above, who was treated at Medina Raptor Center, Ohio. Click here to learn more in this 2009 blog post: Lead Poisoning


(photo from Wikimedia Commons. Click on the image to see the original)

p.s. Last year California became the first state to ban lead in bullets.  They are phasing them out over a period of five years.

2 responses so far

Jan 20 2016

The Tickbird

This week I blogged about a caracara on a capybara but I didn’t tell you much about the bird.  Why was the bird standing on the mammal?  Hint: The falcon’s nickname is “tickbird.”

Yellow-headed caracaras (Milvago chimachima) are omnivorous members of the falcon family who live in south-Central and South America.  They eat almost anything — carrion, frogs, fish, eggs, palm fruit, corn, horse dung — but when it comes to feeding their young they focus a lot on insects.  90% of the nestlings’ diet consists of beetles, grasshoppers and crickets.

They earned their nickname “tickbirds” because they also glean ticks off of cattle and other mammals, including capybaras.  Above, a juvenile yellow-faced caracara cleans a cow.  The cattle don’t mind, even when the caracaras pick at open wounds.

Yellow-headed caracaras have adapted well as the forest is converted to ranches and cities.  When they aren’t picking ticks off cattle they’re gregarious in town.  You’d never guess from this video that their nickname is The Tickbird.


(videos from YouTube. The second video was filmed in Cali, Columbia)

8 responses so far

« Prev - Next »