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About the Cover

Cover Figure


COVER A black-chinned hummingbird (Archilochus alexandri) drinks nectar from a flower of wild tobacco (Nicotiana attenuata). Nicotine in the nectar moderates its consumption by the hummingbird and protects against predators; the flower lip produces benzyl acetone, which attracts pollinators. Together, the repellent and attractant maximize the plant's reproductive fitness. See page 1200. Photo: Danny Kessler

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Science. ISSN 0036-8075 (print), 1095-9203 (online)