Copulation of Japanese Grass Lizards, interrupted by another male

Interruption of copulation by an intruding male

male presenting to male

copulation of Japanese macaques I

copulation of Japanese macaques II

Another inking during copulation in Idiosepius paradoxus

Time-lapse images of concealing behavior at a mating site by a male Japanese badger (Meles anakuma) after copulation

female presenting to male

Egg care of male three-spined stickleback Gasterosteus aculeatus

Rejection of copulation

Copulation of Vespa simillima

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

Chasing and sneaking behavior of male Japanese bitterling

Acceptance of copulation

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

The copulation of guppy

Coercive copulation of guppy

Attempted copulation of cat

Copulation of rabbits

Hindquarters display: courtship display by the male Japanese macaque

Courtship and copulation behavior of firefly, Luciola cruciata

Streaking by non-territorial male of P.aurigarius

Mating behavior of the white-spotted longicorn beetle, Anoplophora malasiaca.2 Male mate orientation regulated by olfactory and visual cues

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

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