Typically, male birds have more vivid colours than females. As Charles Darwin first explained, the most colourful males are ...

We report the second most basal clade of the short-tailed birds (Pygostylia) from the Early Cretaceous. The new family Jinguofortisidae exhibits a mosaic assembly of plesiomorphic nonavian theropod ...

Hoatzins are known as a smelly bird. In fact, they're infamously referred to as one of the stinkiest animals to exist.