 Depending on which sex holds territory in the species, it is advantageous for the other sex to have a longer bill and be able to feed on a wide variety of flowers, decreasing intraspecific competition.For example, in species of hummingbirds where males have longer bills, males do not hold a specific territory and have a lek mating system.In species where males have shorter bills than females, males defend their resources and therefore females must have a longer bill in order to feed from a broader range of flowers.