eggs

Birds live longer in the tropics

April 3, 2018

Adult tropical birds have higher annual survival rates than their temperate counterparts, researchers found, which seems to help balance the smaller clutch sizes of ...

Cowbirds eye egg size for nest selection

June 7, 2017

The brown-headed cowbird (Molothrus ater) may not build nests or raise young, but it does seem to take steps to help its offspring’s survival. When it lays eggs ...