Cowbirds outsource parenting to other species, but an innate password tells their children to copy cowbird songs.
Sponges, one of the most ancient animal lineages, can maintain normal gene activity even as oxygen levels drop.
Researchers find that membranes may have helped the building blocks of life come together.
Researchers are freezing cell samples with liquid nitrogen to keep biodiversity alive. Could this be the best way to conserve species for the future?
Skull was donated by an Inuit hunter in 1990.