Major cheliped use in intruder male during male-male contest of hermit crab

Major cheliped use in owner male during male-male contest of hermit crab

Male-male combat of Otton frogs

Male-male combat of Otton frogs II

Territorial contest in male Chrysozephyrus smaragdinus

Male-male competition in Uca arcuata

Male-male fighting in a butterfly

Male-male competition of Japanese scorpionfly

Male-male agonistic behavior of Carrhotus xanthogramma

Male-male fighting of northern elephant seals

Male-male agonistic behavior of Sitticus penicillatus (2)

Male-male agonistic behavior of Sitticus penicillatus (3)

Male-male agonistic behavior of Sitticus penicillatus (1)

Prior loser vs familiar owner

Male-male fighting of Harbor seals 1

Male-male fighting of Harbor seals 2

Unhappy interaction between male and female fiddler crab: vol.2

Unhappy interaction between male and female fiddler crab: vol.1

Prior loser vs naive owner

The re-invasion behavior of Japanese scorpionfly males that lost the male-male competition

Struggle to dislodge in a heterospecific mating pair consisting of a female Drosophila santomea and male a D. yakuba

The Creggan area in Londonderry also saw major clashes during the Battle of theBogside

Agonistic bahavior between males of domestic cats in the forest

The Disasters of War: They don't arrive in time

NEWS 303: No longer knowing how to use their spare time, the three friends of peace are reduced to making war between themselves