Blue Tit (Cyanistes caeruleus) Science Article 21
abstract
When prey are attacked by predators, escape ability has an obvious influence on the probability of survival. Laboratory studieshave suggested that flight performance of female birds might be affected by egg production. This is the first study of changesin take-off ability, and thus potentially in predation risk, during reproduction in wild birds.
Cecilia Kullberg, David C. Houston, and Neil B. Metcalfe, Behavioral Ecology Vol. 13 No. 4: 575-579