Although frogs are not generally aggressive, during breeding season they may become territorial and antagonistic. Males of many species will wrestle, kick, and bite in order to protect their calling areas. Moreover, some frogs that use boulders and other raised surfaces as calling sites may attempt to knock competitors into the surrounding waters. Males are the most frequent fighters, but female frogs, such as the Venezuelan Colostethus trinitatus, are also willing to exhibit aggressive behavior in order to protect egg-laying sites.