and passionate, crows have brains that are huge for their body size, which allows them to think, plan, and reconsider their actions. They also exhibit an avian kind of eloquence, mate for life, and associate with relatives and neighbors for years. And to people who care for them and feed them, they often give oddly touching gifts in return. The ongoing connection between humans and crows--a cultural coevolution--has shaped both species for millions of years.