These birds may have more friends than you

Vulturine guinea fowl move in highly cohesive groups. This cohesion allows them to coordinate their actions as they move together through the landscape, and therefore maintain stable group membership over extensive periods of time.

(CNN)Complex societies were thought to only exist among mammals, including humans, other primates, elephants, giraffes and dolphins.

But a new study shows that vulturine guinea fowl, a bird with distinctive blue plumage that lives in Africa, can keep track of relationships with hundreds of others -- challenging the prevailing view that big brains are a requirement for complex society.
While many birds live in groups, these birds behave "highly cohesively" and don't display any aggression between groups.
"To our knowledge, this is the first time a social structure like this has been described for birds," said Danai Papageorgiou, lead author of the paper published Monday in Current Biology and a PhD student at the Max Planck Institute of Animal Behavior in Germany.
    Groups of vulturine guinea fowl can become very large, and when multiple groups come into contact the number of birds moving together can reach into the hundreds. However, when these 'super-groups' eventually split, they do so back into their original stable group units, meaning that individuals are knowledgeable about who is part of their group and who is not.