New research reveals older singing male whales are increasingly successful at siring offspring compared to younger males.
Ants and other species who lived alongside dinosaurs but preserved in fossilized tree resin reveal a great deal about their roles.
Australian researchers found that human penis size influences both female attraction and male assessment of rivals.
Belugas are harder to study than most whales as they spend so much time under the Arctic ice.
A research team says their findings could help tackle soaring antibiotic-resistant infections that cause urinary tract infections.
The Apennine brown bear is a small population found only in central Italy, with a long history of closeness to human communities.
Researchers found the plants growing in the different habitats had "significant" differences in several traits, including height and flowering period.
A new study has the clearest evidence yet that territorial expansion after lethal conflict can directly boost reproductive success.