Hummingbird Bills Evolved for Fighting, Research Finds

Male green hermit hummingbirds have bills evolved for fighting, ⁣research finds.

Let’s get one thing ⁢out of the way: all hummingbirds fight. Most species fight for food, using their tiny bodies and sharp ⁣bills to force competitors away from flowers.

But⁤ the green hermit hummingbird, which lives primarily in mountain forests of Central and South America, fights⁤ to win a mate.

“They gather⁤ together at‍ a place ⁤in the forest that looks just like a singles bar,” says Alejandro Rico-Guevara, ⁢an associate professor of biology at the⁣ University of Washington.

“They all have perches, and if someone else takes their perch-their place in the⁣ singles bar-they go bananas, ⁣and they fight.”

Hummingbirds’ weapon of ⁣choice? ⁣Their own bills. Like medieval⁢ knights in ⁣a joust, the birds raise a long, needle-thin bill into the air before driving it into their opponent. The stakes⁣ are high: hummingbirds‍ also use their bills to eat, poking them deep into flowers to reach nutrient-rich nectar. Losing a fight means a hummingbird might not find a mate. Breaking a bill could mean they starve.

New research led by researchers at the UW Burke Museum of Natural History and Culture, where Rico-Guevara is the⁢ curator⁢ of birds, found that these fights have shaped the species’ evolution, yielding significant differences in bill shape for male and female green hermits.

Compared to their female counterparts, male green hermits’ bills are straighter, sharper, and structurally stronger. The straighter bills work better as weapons, while‍ female birds’ more curved bills provide improved access to nectar ⁣in some⁢ flowers.

The findings suggest ‍that green hermits’ bill sexual dimorphism-when two sexes of a ‍species exhibit differ