Archive for the 'Birds of Prey' Category

Apr 12 2014

Holding His Own

Three healthy eaglets at Pittsburgh Hays bald eagle nest, 11 April 2014 (phot ofrom the Pittsburgh Hays eaglecam)

If you’ve been worried about the survival of Eaglet#3 at the Pittsburgh Hays bald eagle nest, you can ease your fears a bit.  Today the eaglets are 15, 13 and 10 days old.

On April 3 I described how competition among bald eagle siblings can cause the smallest eaglet to starve if food is scarce.   The good news is that the older they get, the better their chances for survival.

So far so good.  Eaglet #3 is active and growing and he’s getting fed.  Food is abundant. He’s holding his own.

The food supply is one more indication that Pittsburgh is a great place to raise a family.  But we knew that.  :)

 

(snapshot from the Pittsburgh Hays eaglecam.  Click on the image to watch the live stream)

Update:  Hmmmm. At 9:25am the three eaglets were very hungry and there was nothing to eat yet.  Eaglet#1 took a whack at Eaglet#3 who crouched with his face down to avoid attention.   Hmmmm. We shall see…

Eaglet#3 crouches to avoid another hit from Eaglet#1 (snapshot from the Pittsburgh Hays eaglecam)

12 responses so far

Apr 06 2014

Here’s How They Did It

You may be wondering how far the eaglecam is from the Pittsburgh Hays bald eagles’ nest and how it works out there in the woods.

This video from the Pennsylvania Game Commission shows how the eaglecam was installed last December and all the gear that makes it run.

I don’t know who climbed 75 feet up the camera tree but he was surely brave!

The man on the ground arranging the solar panels and batteries is Bill Powers of PixController.  He installed Pittsburgh’s two falconcams, too.

Many thanks, Bill, for all you do!

(YouTube video from the Pennsylvania Game Commission)

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Apr 03 2014

Three Eaglets … For Now

Third bald eagle egg hatches at the Hays nest (snapshot from the Pittsburgh Hays eaglecam)

Yesterday afternoon around 5:00pm the third and final egg hatched at the Pittsburgh Hays bald eagle nest.  This happened during rush hour so a lot of us missed it … or did you stay late at work to watch?

Click on the photo above to watch the eaglet emerge from his egg.

An hour later all the eaglets are visible as Mom feeds the oldest chick.

Her actions reminded me that we will soon see a characteristic of bald eagle family life that’s quite different from peregrines’ –  the tendency for the oldest eaglets to thrive and the youngest to die, sometimes killed by their siblings.

Bald eagle eggs hatch asynchronously so each new eaglet is two days smaller than the previous chick.  Bald eagle parents feed the chick that asks for food, and since the oldest is bigger and more active he’s fed more than his siblings.  Eagle chicks are aggressive toward their siblings and the parents don’t breakup the fights.  The third chick often starves.  Cornell’s Birds of North America Online describes it this way, referring to a study in Saskatchewan:

Hatching asynchrony and differential growth leads to differential mass in siblings, facilitating competition and fratricide. Sibling competition and mortality is greatest early in nestling period, when size differences are greatest. Third-hatched chicks in Saskatchewan nests received little food and usually starved.

This behavior is quite different from the peregrines’ lifestyle.  Peregrine falcon eggs hatch almost simultaneously so all the chicks are close in age and size.  The last chick may be smaller at first because he hatches two days later, but peregrine chicks are not aggressive and their parents make sure everyone eats at every feeding.   Mother peregrines “chup” to their babies to encourage them to stand up and be fed.  Click here see how effective (and cute) this is.

For now there are three eaglets at the Pittsburgh Hays eaglecam … but be prepared for the day when there might be only two.

 

(videos and snapshots from the Pittsburgh Hays eaglecam)

30 responses so far

Apr 01 2014

A Threat To Bald Eagle Nests

Aerial photo taken after a logging operation along the Rappahannock River cut an eagle nest tree. This forest block supported a bald eagle nest for ten years prior to the harvest. Photo by Bryan Watts. (linked from The Center for Conservation Biology)

 

The Internet is captivated by the Hays bald eagle family nesting on a wooded hillside in Pittsburgh.  Their nest is protected by the Pennsylvania Game Commission and worldwide media attention, but what happens to nests that aren’t so famous?  Here’s the story of an unexpected consequence of removing bald eagles from the federal endangered list.

For 40 years bald eagles were completely protected by the Endangered Species Act (ESA) and everyone understood not to harm them.  By 2007 the birds made such a great recovery that they were removed from the federal ESA listing. Fortunately they are still protected by a law of their own, the Bald and Golden Eagle Protection Act that protects eagles, their eggs and their nests.

The Center For Conservation Biology (CCB) in Williamsburg, Virginia monitors bald eagle nests in the Chesapeake Bay area where 75% of the nests are on private land.  Each spring they fly over the watershed twice: once to count occupied nests, later to count chicks.  Last month CCB reported what they’ve found after 6+ years without ESA protection:  a real increase in the number of eagle nest trees cut down.

Bald eagles use same the nest for many years so when CCB flies over the area in early March, they look for known as well as new nests.  Increasingly they find former nest trees are gone, cut down when an area is wiped out by a large logging operation like the one above.

Private landowners apparently don’t realize the Eagle Act protects the nest, so the well-publicized de-listing of the bald eagle has lead to an unintended consequence:  disregard for the eagles’ habitat and nest trees.  CCB points out that education of landowners is sorely needed.

Click on the photo above to read the full story at The Center For Conservation Biology.

 

(photo of a clearcut along the Rappahannock River in Virginia, linked from The Center For Conservation Biology blog.  Click on the image to read the article)

2 responses so far

Mar 31 2014

Four Celebrities

Pittsburgh's Hays Bald Eagle family, 30 March 2014, 2 parents, 2 chicks, 1 remaining egg (photo from the Hays eaglecam)

Yesterday was a big day for the Pittsburgh Hays bald eagle family.  Their second eaglet hatched just after dawn, and the whole family was featured on ABC World News with David Muir.

Above, both parents feed the chicks on Sunday afternoon.

Click here for the ABC news segment.

Their third and last egg is due to hatch April 1.

Watch them “live” on the eaglecam.

 

(photo from the Pittsburgh Hays eaglecam)

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Mar 29 2014

Eaglet’s Parents Celebrate

First eaglet of 2014 at Pittsburgh's Hays bald eagle nest, 28 March (snapshot from the eaglecam)

There he is, the first eaglet of 2014 at the Pittsburgh Hays bald eagle nest.  He’s hard to see because he matches the nest, hence the arrow.  The two remaining eggs and his discarded eggshell (closest to Dad’s beak) stand out.

This tiny gray ball of fluff emerged on a warm and windy afternoon, March 28, under his mother’s gaze.  As soon as he was dry she brooded him until Dad returned with food.

Click on the snapshot above to watch “Hays Parents Celebrate Hatch.”  Dad has brought a fish to share.  While Mom eats, Dad studies the eaglet. “Is he hungry?” Not yet, so Dad rearranges the nest.  Mom leaves on a well-deserved break and Dad settles down to brood the chick.

Bald eagles brood their nestlings during cold and inclement weather until they’re about four weeks old.   In the first week the brooding is almost constant because the nestlings can’t regulate their own body temperature.  This also serves the dual purpose of incubating the unhatched eggs while keeping the eaglet(s) warm.

The next egg is slated to hatch on March 31.  Watch the eaglecam to see.

 

p.s. Don’t forget you can also see the eagles in person today (March 29) on the Three Rivers Heritage Trail with the National Aviary’s Bob Mulvihill, 9:00am to noon.  Click here for more information.

(snapshot from Pittsburgh Hays Eaglecam, broadcast by WildEarth)

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Mar 28 2014

The Eaglet Has Landed!

The first eaglet of the season hatched today in the Pittsburgh’s Hays Bald Eagle nest at approximately 2:30pm.  In this YouTube video captured by PixController you can see the baby bird next to two eggs and his own eggshell.  Then mom comes over to help.

Watch him on camera here at PixController or here on the National Aviary website.

Media Attention:  He’s already a celebrity!

Festivities tomorrow!    March 29, 9:00am to noon, watch the nest at Hays — in person!

National Aviary Ornithologist Bob Mulvihill will be at the Hays Bald Eagle nest site tomorrow morning from 9 a.m. until noon with the spotting scope donated by Wild Birds Unlimited! Feel free to stop by for a really good look at the nest, maybe even catch a glimpse at what’s going on IN the nest!
Parking is available courtesy of Keystone Iron and Metal Co. in their employee parking lot at the end of Baldwin Road (see map), or use the address 4901 East Carson Street into your GPS!
The viewing site is a short distance from there: carefully cross the railroad tracks and turn left onto the trail. Bob will be about 200 feet down the trail with the spotting scope!
Click here for a map of how to get there.

Thanks to the PA Game Commission and PixController for bringing this eagle family up close.

 

3 responses so far

Mar 01 2014

Bald Eagle On The Hunt

Published by under Birds of Prey

Bald eagle on the hunt in Florida (photo by Chuck Tague)

While we can watch bald eagle family life online at the Hays nest in Pittsburgh, we can’t see how the male eagle captures the food he brings to his lady.  His hunting happens far away.

This photo taken in Florida by Chuck Tague shows how bald eagles do it.  They fly over, keep their eagle eyes on the prey, and pounce.  Eight sharp talons grasp the fish (or duck) and the job is done.

Watch out below!

 

(photo by Chuck Tague)

One response so far

Feb 28 2014

Raccoon Makes A Mistake

Published by under Birds of Prey,Mammals

 

Late Wednesday night, February 26, at 11:15pm a raccoon climbed the bald eagles’ nesting tree at Hays while a noisy train rumbled by in the valley.  Mother Eagle was asleep but she heard the raccoon’s rustle and stood up to defend her three eggs.  As the mammal crested the nest edge she opened her wings and took a few steps toward it.  The raccoon turned and fled.

When you watch the encounter on this archived video from PixController you can see everything that’s going on, but the participants can’t.  The nest is lit at night by an infrared lamp mounted near the distant camera.  The camera can “see” the infrared light but we, the eagle, and the raccoon cannot.  On that overcast night the animals were dark shapes to each other.  I’m sure the raccoon was frightened to find an eagle!

Raccoons raid songbird nests because the songbirds are powerless to stop them but they avoid raptors because birds of prey will kill them.  Why was this raccoon attracted to a bald eagles’ nest?

Scott Kinsey gave us the hint on PABIRDS yesterday morning when he wrote:

It has been fun watching the Bald Eagle nest cam from Pittsburgh.  Finally got to see a feeding.  I think it was the male brought a fish for the female at 10:39am.  She had it done by about 10:47 and back on the eggs. Might have been a Gizzard Shad around eleven inches?

As Scott points out, the female eagle eats at the nest and though she sets the scraps aside she doesn’t take out the garbage.  Lots of smelly fish scraps are up there on the sticks.   The raccoon probably smelled the leftovers and came exploring for a meal.  When he realized his mistake he was out of there!

This surely isn’t the first time a raccoon has explored an eagles’ nest at night.  We just happened to see it because of the night vision camera.  He was lucky he didn’t make a fatal error.

Click here to see what’s happening right now at the eagles’ nest.

 

(video from the Pittsburgh Eaglecam by PixController)

p.s.  This episode points out another difference between bald eagles and peregrines.  Adult peregrines don’t eat at the nest during incubation and even when feeding nestlings they take out the garbage.

4 responses so far

Feb 22 2014

Athene

Burrowing owl near Goiânia, Goiás, Brazil, standing on one leg (photo from Wikimedia Commons)

The burrowing owl’s genus is named for Athena, goddess of wisdom.

In Brazil, this Athene cunicularia stood on one leg for his portrait.

Thinking big thoughts?

 

(This photograph was Picture of the Day at Wikimedia Commons on 19 February 2014.  Click on the image to see the original.)

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