News Life Hummingbirds take stab at rivals with dagger-tipped bills Males reaching the age of competitive courtship grow a sharp weapon WEAPONS Hummingbird bills can turn into dagger-pointed weapons among long-billed hermits (shown in flight). Chris Jimenez By Susan Milius November 3, 2014 at 6:08 pm - More than 2 years ago Share this:Share Share via email (Opens in new window) Email Click to share on Facebook (Opens in new window) Facebook Click to share on Reddit (Opens in new window) Reddit Click to share on X (Opens in new window) X Click to print (Opens in new window) Print View the video Male hummingbirds that mate in the feathered version of singles bars grow sharp points on their bills, perfect for jabbing rivals.