New study on Gouldian finches. Your colour, your size and your song are what matters if you are a bird choosing a mate. In a polymorphic species, where several colour variations exist side-by-side, mates are chosen often because they match the chooser.
The European Magpie is an infamous thief known to steal shiny objects such as gold and jewels. It is also considered one of the smartest animals on the planet and is the only non-mammal able to recognize itself in a mirror