Competition for mate in male striped eel catfish

Male-male competition for eggs in the filefish Rudarius ercodes

Male-male competition in Uca arcuata

Competition over food resources in the snake Dinodon semicarinatus

Male competition of the field cricket

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

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

female presenting to male

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

Mate feeding and egg brooding in the male peregrine falcon 2

Mate feeding and egg brooding in the male peregrine falcon 1

Mate feeding and egg brooding in the male peregrine falcon 3

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

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

A male baikal teal following a female with calling

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

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

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

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

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

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

Intrusion of cuckold male bluegill into spawning nest

Geisha striking a pose in a striped kimono. A dresser is in her room

(A woman dressed in male craftsman costume)

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