Are modern societies built on bloody foundations? Ritual human sacrifice seems to be key to the emergence of inherited class systems: powerful members of society carried out these killings to control, terrorise and impress the lower ranks. Image: Ilhuicamina
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It’s a social network like no other. The dolphins of the Bahamas forage and play together and forge alliances – even though they belong to two distinct species. They’re not the only example of mixed-species dolphin groups, but this level of interaction is unprecedented. Image: harrisongavin18
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Jane Goodall has been studying the chimpanzees of Gombe for over 50 years. During the early 1970s the group appeared to split in two, and friendliness was replaced by fighting – a new analysis suggests the society fell apart just like human societies do. Image: pattoise
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