Hummingbirds are known as strong, aggressive and have even been labeled as "angry" by some researchers, but a certain species of the bellicose birds have taken their anger to a new level — they've started to develop "weaponized" beaks used for fighting and not eating. Some male hummingbirds in South America, which can weigh as little as one-tenth of an ounce, have developed straighter bills containing serrated teeth to outduel rivals for the best spots to eat. “But also, people haven’t actually looked at the details of the beaks. The weaponized beaks are not adept for sipping nectar, Rico-Guevara said "fuels their lives,” further providing evidence that the evolutionary feature is likely due to help fend off the competition. "So they don’t fight for access to resources, like in the territorial species, but they actually fight for an opportunity to reproduce."

Source: Fox News January 07, 2019 16:24 UTC