Sperm competition
Videos
Sperm competition is the competitive process between spermatozoa of two or more different males to fertilize the same egg during sexual reproduction. Competition can occur when females have multiple p
Stained human sperm
Human spermatozoa
Neolamprologus pulcher
Indianmeal moth
Mating plug
Videos
A mating plug, also known as a copulation plug, vaginal plug, sperm plug, or sphragis, is a gelatinous secretion used in the mating of some species. It is deposited by a male into a female genital tra
Sperm competition
…success. Sperm competition results in a sexual conflict between males and females. Males have evolved several defensive tactics including: mate guarding, mating plugs, and releasing toxic seminal substances to reduce female re-mating tendencies to cope with sperm competition. Offensive tactics of sperm competition…
A mating plug in a female Richardson's ground squirrel (Urocitellus richardsonii)
Sphragis on female Parnassius apollo butterfly