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

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

Male-male combat of Otton frogs

Male-male combat of Otton frogs II

Prior loser vs familiar owner

Territorial contest in male Chrysozephyrus smaragdinus

Male-male competition in Uca arcuata

Male-male fighting in a butterfly

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

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

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)

Male-male fighting of Harbor seals 1

Male-male fighting of Harbor seals 2

Prior loser vs naive owner

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

Agonistic bahavior between males of domestic cats in the forest

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

A change of courtship waving display and pair formation in a fiddler crab

Reproductive behavior of domestic cats during the mating season in the forest

La Tauromaquia [The Bullfight]: The unlucky death of Pepe Illo in the ring at Madrid