Chimpanzees produce a “hunting bark” to call members of their group and co-ordinate a hunt, new research suggests. Similar to humans, the animals use communication to coordinate their cooperative behaviour – such as during hunting.

Orcas ‘talk’ to each other constantly but after being set free, poor Keiko never mastered the local dialect

Like humans, wild chimpanzees focus on fewer but more meaningful friendships as they grow older, research suggests. The study provides the first evidence that non-humans also exhibit age-related social selectivity, researchers say.