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

female presenting to male

A Male and a Female Adhering to a Parallele-piped

Male three-spined stickleback chasing a female out of the territory

Indiscriminate consumption of unrelated eggs by a gravid female and a satellite male in natural nests

Female Eastern Crowned Leaf Warbler attack the Oriental Cuckoo that approach her nest

male presenting to male

female presenting to female

Courtship behavior of female three-spined stickleback Gasterosteus aculeatus

Male-male competition for eggs in the filefish Rudarius ercodes

Streaking by non-territorial male of P.aurigarius

Pair spawning by territorial male of pteragogus aurigarius

Group　spawning by non-territorial male of P.aurigarius

Homosexual necrophilia in the Sand Martin

Homosexual necrophilia in the Sand Martin

A male baikal teal following a female with calling

By the Mosquito Netting (Actor and Male Performer in Female Guise)

A male Red Ring Skirt (Hestina assimilis) tried unsuccessfully to mate with a female feeding on tree sap

Allo-grooming by workers to young larvae in Reticulitermes speratus

Female Head in Mezzotint

Alternative male mating behaviors dependent on relative body size in the oval squid

the guard of eggs by paternal millipede, Brachycybe nodulosa Verhoeff

Children in the neighborhood of Tomio Kondo are used to having pictures taken of them. They use the rays of the sunset skillfuly

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

Interruption of copulation by an intruding male