When dogs recall toys and horses plan ahead, are animals so different from us?

The mental territory we can claim to be “uniquely human” is shrinking at an alarming rate. Wasps can distinguish faces, dolphins call one another by name, pigs use tools, zebra finches dream, parrots go on Zoom, and sometimes crayfish get anxious. Chimps, meanwhile, exist in complex cultures, rather like ours, with fashion trends. In one recorded instance, a high-ranking female chimp started wearing grass in her ears. Within a week, all the female chimps were doing it.