Males reaching the age of competitive courtship grow a sharp weapon
Male hummingbirds that mate in the feathered version of singles bars grow sharp points on their bills, perfect for jabbing rivals.
That little dagger point forms on the upper part of the bill as young male long-billed hermits (Phaethornis longirostris) reach adulthood, reports Alejandro Rico-Guevara of the University of Connecticut in Storrs. And tests of those hummingbirds’ bills show that enhanced tips boost piercing power. Birds don’t grow horns or antlers. But a dagger-tipped bill may have evolved as male-versus-male weaponry, Rico-Guevara and Marcelo Araya-Salas of New Mexico State University in Las Cruces suggest October 18 in Behavioral Ecology.