Apr 28 2013

Just One Now

Published by at 6:11 am under Nesting & Courtship,Peregrines

Dorothy feeds one chick, 27 April 2013 (photo from the National Aviary falconcam at Univ of Pittsburgh)

When you watch a feeding at the Cathedral of Learning peregrine nest you'll see just one baby now.

As early as Friday morning, only 12 hours after he hatched, I could tell something was wrong with Chick#2.  He was noticeably weaker and his movements were odd and uncoordinated.  He seemed to have a developmental problem that caused spasms.

The big clue was that he left the nest.  This is abnormal and life-threatening behavior in a chick so young.  Peregrine nestlings must be brooded by their parents during their first week of life because they can't thermoregulate yet.

On Friday afternoon Chick#2 literally rolled in a ball out from under Dorothy's tail.
Chick#2 rolls in a ball out from under Dorothy (photo from the National Aviary falconcam at Univ of Pittsburgh)


And here he moved outside Dorothy's wing in 41 degree weather on Saturday morning.  He must be twitching a lot considering the look on her face.
Chick#2 twitchy outside Dorothy's wing (photo from the National Aviary falconcam at Univ of Pittsburgh)


Midday Saturday he moved out of the nest scrape and did not return for feedings.  Here Dorothy and E2 seem to confer about him on Saturday afternoon.  (He is lying in the shade beyond them.)  There was nothing to be done. He was too handicapped to survive.
Dorothy and E2 confer about Chick#2 (photo from the National Aviary falconcam at Univ of Pittsburgh)

This leaves just one surviving baby out of five eggs.  Until this year Dorothy always raised three to five young per nesting season -- but she is 14 years old now.

Her low hatch rate and handicapped chick are both normal outcomes considering her age.  Just as in humans, older mothers have fewer babies and are more likely to produce handicapped young.

I am sorry to see this happen because Dorothy is my very favorite peregrine.  But the reality is that Dorothy, like all of us, is aging.

The good news is that Chick#1 is healthy and vigorous.  He will get lots of attention and education from his very experienced parents.

One bright-eyed chick awaits breakfast, 28 Apr 2013 (photo from the National Aviary falconcam at Univ of Pittsburgh)

(photos from the National Aviary falconcam at the University of Pittsburgh)

14 responses so far

14 Responses to “Just One Now”

  1. Pa Galon 28 Apr 2013 at 8:14 am

    Kate, this is so terribly sad. Are you saying that the remaining three eggs will not hatch, leaving Dorothy and E2 with just the one chick?

  2. Kate St. Johnon 28 Apr 2013 at 8:17 am

    Yes, the last 3 eggs probably won’t hatch.

  3. Marylou Marinoon 28 Apr 2013 at 8:30 am

    This is so sad….

  4. Carol Smithon 28 Apr 2013 at 8:44 am

    I try to think of nature as just nature, neither kind nor cruel, and life as just a continuous opportunity for experience, good and bad. It really is the only way I can deal with it. Dorothy has served her purpose of procreation well. Can you predict what will happen when nesting time comes around again? Will it take Dorothy’s death to end her egg-laying days…will E2 seek out a new, younger mate…will another female recognize that Dorothy is declining and drive her from her territory? Or will it be another case of only time will tell?

  5. Kate St. Johnon 28 Apr 2013 at 8:51 am

    Carol, I don’t know. Anything can happen. Dorothy’s first mate, Erie, disappeared in the fall of 2007 without any intruder trying to take his place. In 2010 at the Gulf Tower, Dori “intruded” and chased away Tasha. Only time will tell.

  6. Kathyon 28 Apr 2013 at 11:33 am

    So very sad. The picture of Dorothy and E2 is so very touching.

  7. Dianeon 28 Apr 2013 at 3:32 pm

    What will happen with the 3 remaining eggs? Will Dorothy continue to nest over them?

  8. Kate St. Johnon 28 Apr 2013 at 3:41 pm

    Diane, Dorothy will continue to incubate the eggs until her chick doesn’t need to be brooded anymore. Then she will push the unhatched eggs aside.

  9. Jennieon 28 Apr 2013 at 4:04 pm

    Thanks, Kate, for keeping us updated, even when there is bad news in with the good. I’m sure we will all be pulling especially hard for this little one.

  10. Joann Lon 28 Apr 2013 at 8:25 pm

    How sad but that is Mother Nature’s way-the weak can’t survive. I’m not sure but at 8:25 PM there is an open shell-is this the one that was up against the wall in the pictures above?

  11. Kate St. Johnon 28 Apr 2013 at 8:27 pm

    That she’ll is likely to be the same one that’s been kicking around for a while.

  12. Ellenon 28 Apr 2013 at 10:42 pm

    Since the eggs were laid over a 10-day period, why doesn’t the hatching take a similar length of time?

  13. Kate St. Johnon 28 Apr 2013 at 10:46 pm

    Peregrines eggs hatch after 33-35 days of incubation. Unlike bald eagles, peregrines wait to begin incubation until the clutch is nearly complete. That means that most of the eggs hatch within a day of each other. The last egg to hatch is delayed about 2 days because it was laid after incubation began. In this case the three remaining eggs are very unlikely to hatch.

  14. Paton 30 Apr 2013 at 5:48 pm

    Kate, I’m so sad about Dorothy’s chicks. Our girl is tough, she’ll hang in there.

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