CHICAGO — It’s springtime, and the birds are chirping as they begin to build their nests. Researchers say the hands-on clock is turning back, though it happens like clockwork each year. Many species ...

Pablo Capilla-Lasheras has received funding from the Biotechnology and Biological Sciences Research Council (UK) and currently works at the University of Glasgow. Tswalu Kalahari Reserve is a ...

Wisdom, a Laysan albatross, has outlived at least three mates and the researcher who outfitted her with a tracking band in 1956. By Sara Ruberg The world’s oldest known wild bird, a 74-year-old Laysan ...

The number of eggs a bird lays — its clutch size — varies greatly among species. You might think every species should simply lay lots of eggs because that would increase the odds of more young birds ...

On a fine Monday morning in May, a bluebird lays her first egg. She produces another one the next day, another on Wednesday and her fourth and last blue egg is added to her nest on Thursday. Nearly ...

Q. When we studied high school biology, our teacher said more than 99% of animals lay eggs and only a few give live birth. That percentage seems too high. Humans, dogs, cats and cows are ...