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Humans know the surprising prick of a needle, the searing pain of a stubbed toe, and the throbbing of a toothache. We can identify many types of pain and have multiple ways of treating it — but what about other species? How do the animals all around us experience pain? Robyn J. Crook examines pain in both vertebrate and invertebrate animals.

Lesson by Robyn J. Crook, animation by Anton Bogaty.