Birds are vertebrate animals adapted for flight. Many can also run, jump, swim, and dive. Some, like penguins, have lost the ability to fly but retained their wings. Birds are found worldwide and ...

By combining data on all known bird species, this tree is the most impressive snapshot yet of one of Earth’s most ...

Animals without a backbone are called invertebrates. Vertebrates and invertebrates can be sorted into smaller groups. Vertebrates, for example, are divided into mammals, birds, reptiles ...

Imagine a world where the boundaries between “fish” and “not-fish” blur, where the ancestors of birds and mammals once swam ...

One possibility is that intelligence in vertebrates — animals with backbones, including mammals and birds — evolved once. In that case, both groups would have inherited the complex neural pathways ...

Had birds and mammals evolved placodes independently? Or had today’s reptiles discarded them? Then University of Geneva biologist Michel Milinkovitch visited an Italian animal fair, found ...

Vertebrates are animals that have a backbone inside their body. The major groups include fish, amphibians, reptiles, birds and mammals. Invertebrates don't have a backbone. They either have a soft ...