Male-male fighting of Harbor seals 2

Male-male fighting of Harbor seals 1

Male-male fighting of northern elephant seals

Male-male agonistic behavior of Sitticus penicillatus (2)

Male-male competition of Japanese scorpionfly

Male-male fighting behavior of the seed bug, Togo hemipterus

Male-male agonistic behavior of Carrhotus xanthogramma

Male-male fighting in a butterfly

Male-male agonistic behavior of Sitticus penicillatus (3)

Male-male agonistic behavior of Sitticus penicillatus (1)

Male-male competition in Uca arcuata

Male-male combat of Otton frogs

Male-male combat of Otton frogs II

Female fighting of Dorcus rectus rectus

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

Agonistic interaction of Kajika frog (Buergeria buergeri) 2: escalated fighting

Female-female fighting behavior of the Japanese horned beetle

Territorial contest in male Chrysozephyrus smaragdinus

The hostility action of Harbor seal

Fighting Thomson's gazelle

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

オイカワの雄間闘争

セボシタビラの雄間闘争

アブラボテの雄間闘争

Male-male competition for eggs in the filefish Rudarius ercodes