Streaking by non-territorial male of P.aurigarius

Group　spawning by non-territorial male of P.aurigarius

Pair spawning by territorial male of pteragogus aurigarius

Territorial contest in male Chrysozephyrus smaragdinus

Territorial contest in a dragonfly

Interruption of copulation by an intruding male

Territorial defense of male three-spined stickleback Gasterosteus aculeatus

Copulation of Japanese Grass Lizards, interrupted by another male

Approach with stalking by the male to the female in Microvelia horvathi Lundblad, 1933

the guard of eggs by paternal millipede, Brachycybe nodulosa Verhoeff

Male-male competition of Japanese scorpionfly

male presenting to male

セボシタビラのメスによる縄張り行動

セボシタビラのメスによる縄張り行動②

セボシタビラのメスによる縄張り行動

Male-male agonistic behavior of Carrhotus xanthogramma

Male-male fighting of northern elephant seals

Male-male fighting of Harbor seals 1

Male-male fighting of Harbor seals 2

Male-male agonistic behavior of Sitticus penicillatus (2)

Male-male agonistic behavior of Sitticus penicillatus (3)

Male-male agonistic behavior of Sitticus penicillatus (1)

Display of a male phesant

Egg-predation defense by the deception of a male three-spined stickleback Gasterosteus aculeatus

Nest defence against a brood parasite by a male Japanese bush warbler