A deep dive into how some male hummingbirds have evolved tool-like bills—long, straight, and thick-bassed—to win fights over territory and mates. We examine the long-billed hermit, where juveniles start with curved bills that straighten as they mature, making the weapon appear in adulthood, and discuss how these designs resist axial loads during sparring and can cause more damage with less effort. We’ll also look at other outliers like the tooth-billed hummingbird and what these adaptations mean for sexual selection and ecological roles. This backyard drama is real, high-stakes evolution in action.
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