Why do some birds only learn for a short period of time, while others learn for life? How does a longer learning window affect their song? Could mating preferences, such as females preferring complex ...

Bonjour! Ni hao! Merhaba! If you move to a new country as an adult, you have to work much harder to get past that initial “hello” in the local language than if you’d moved as a child. Why does it take ...