Why do dogs sniff bottoms?

Lily Snowden-Fine is an illustrator and painter based in Toronto. Her clients include The New York Times and The Globe and Mail among others. She was the voice of the original Peppa Pig when it first aired in 2004. Her parents are Academy Award-winning animators Alison Snowden and David Fine. Dr Nick Crumpton is a zoologist at University College London, and has worked at the Natural History Museum and for the BBC as a journalist and researcher. He is the author of The Amazing Animal Atlas.

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