Hummingbirds take stab at rivals with dagger-tipped bills

Males reaching the age of competitive courtship grow a sharp weapon

Hummingbird

WEAPONS  Hummingbird bills can turn into dagger-pointed weapons among long-billed hermits (shown in flight).

Chris Jimenez

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Male hummingbirds that mate in the feathered version of singles bars grow sharp points on their bills, perfect for jabbing rivals.