Many birds have an excellent sense of smell. And the odors that birds make can act as mating signals for some species. The source for many of these scents, says biologist Danielle Whittaker, are the microbes that live in birds’ preen oil, which they use to keep their feathers in good condition. Danielle and other scientists are studying how the genes that regulate birds' immune systems might help control these microbes. This research could help connect the birds’ genetics to the scents they use to attract mates. Learn more in Danielle Whittaker’s book, The Secret Perfume of Birds: Uncovering the Science of Avian Scent. 

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