The group size that is optimized for different collective behaviour algorithms varies as a function of the goal the group is pursuing in a particular ecological context.

We report the first field study of the intra-group vocal behaviour of golden lion tamarins (Leontopithecus rosalia). We present the contexts in which the five predominant intra-group vocalizations ...

Newly discovered ancient chains of up to 20 crustaceans linked head-to-toe are the earliest record of collective behaviour in any animal ...