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Cover: A male red-winged blackbird (Agelaius phoeniceus) perches in a Canadian marsh. Like many habitats, marshes face increasing pollution by anthropogenic noise from traffic, industry and urban centres. Noise pollution masks the birds' acoustic signals, which are crucial for defending territories and attracting mates. If the birds are unable to adapt, they may be extirpated from affected areas. A new study by Hanna et al. (pp. 3549−3556) shows that red-winged blackbirds alter the structure of their songs in response to traffic noise, a strategy that may enhance communication in a noisy environment. Photo credit: Brendan Graham.