facebook
twitter
rss
account
search
search

Study: Cuckoo eggs given 'head start'

Sept. 22, 2010 at 7:35 PM   |   Comments

SHEFFIELD, England, Sept. 22 (UPI) -- British researchers say they've solved the mystery of how a cuckoo chick is able to hatch in advance of a host's eggs and brutally evict them from the nest.

Scientists at the University of Sheffield say female cuckoos "internally incubate" their eggs for 24 hours before actually laying them in a host victim's nest, giving the cuckoo egg a head start over the host's eggs, a university release said.

This allows the cuckoo chick to hatch before its nest mates, evict them and monopolize the food brought by the foster parents.

"The idea of internal incubation in birds has until now been considered impossible because it was assumed that female birds could not hold onto a fully formed egg," Tim Birkhead of the university's Department of Animal and Plant Sciences said.

"In fact, the idea of internal incubation by cuckoos was suggested as early as 1800, but then ignored.

"Our results show that internal incubation gives cuckoo chicks that crucial head start in life, allowing them to dispose of their nest mates -- a superb adaptation to being a brood parasite."

The study was published in the journal Proceedings of the Royal Society of London.

© 2010 United Press International, Inc. All Rights Reserved. Any reproduction, republication, redistribution and/or modification of any UPI content is expressly prohibited without UPI's prior written consent.
Most Popular
1
Cape Cod scientists tag first great white shark of season
2
Dinosaurs shrank for 50 million years before becoming birds
3
Music helps cows relax, produce more milk
4
Five-minute video visualizes history of human culture
5
Thousands of velellas wash up on the shores of San Francisco
Trending News
Video
x
Feedback