Hummingbird males attack one another with their sharp, sword-like beaks to prove to be the best candidate to mate with female, said researchers from the University of Connecticut. The researchers reached at the conclusion after closely studying male hummingbirds during their mating season. Beaks of males and female hermit hummingbirds, Phaethornislongirostris have different shapes than each other.
This gory competition to win the right to mate with a female involves jabbing and thrusting of beaks into each other's throats, resulting into deaths. The study results are helping scientists to gain insight into the evolution of aggressive bird species.