female presenting to male

male presenting to male

female presenting to female

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

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

Courtship behavior of male red-eared sliders and female rejection response

Encountering when a male visited the territory of a female

A male baikal teal following a female with calling

A male fiddler crab captured a female and took her into his burrow

A male baikal teal displaying head-pumping in front of a female

A male three-spined stickleback Gasterosteus aculeatus refused the courtship from a female

Courtship display of male Northern Pintails, and submerging of a female for escape

Male three-spined stickleback Gasterosteus aculeatus under fanning turned out a female

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

Courtship behavior of female three-spined stickleback Gasterosteus aculeatus (2)

Female cat solicits male

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

Egg care of male three-spined stickleback Gasterosteus aculeatus

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

シロスジカノコハエトリ C.ogatai オスによるメス死体への求愛・交接

Mating behavior of the white-spotted longicorn beete, Anoplophora malasiaca.-1. Male mating trial to a glass-rod treated with female pheromonal extract

Egg-laying of a male-colored female common skimmer

Intrusion of cuckold male bluegill into spawning nest

Interruption of copulation by an intruding male

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