Nazca boobies are the largest of the boobies on the Galapagos. They were once called ‘masked boobies’ because of the dark color mask around their eyes. There are masked boobies, but the ‘real’ Nazca booby has a orangy-reddish beak. They nest on the ground and breed annually producing two eggs that hatch a few days apart.
I learned about bird ‘siblicide’ on this trip. Many boobies have two hatchlings, but only one of the chicks survives--and it’s not an accident. The stronger chick eventually throws the smaller, weaker sibling out of the nest.
Why did this behavior evolve? Maybe laying two eggs assures that if a predator gets to the first egg, there will still be offspring. But if both hatchlings survive, the older booby gets rid of the younger and the parents do not interfere.
Neither do we. Going a little out of sequence.... later in the trip, on Espanola Island, we see two blue-footed booby chicks with their mother. The well-fed, larger chick is safely nestled under mom. Ousted from shelter and slowly starving is the small chick in the foreground.
The short hard life of the second booby chick |
Back to Genovesa. Families of birds everywhere I turn, and they are not in the least bit interested--or intimidated --by me.
I introduce myself to an unintimidated booby... |
....and its friend |
Feeding time |
Redfooted booby and chick |
What?
Porchfests.... for the tourist at home.
# # #
No comments:
Post a Comment