When a rival fish father sprays a pile of eggs with its semen, this species of male fish will use their tail fin to swish away the seed. So says a new study by a group of Japanese scientists regarding ...

The ocean is home to a vast array of different animals, each with its own traits. These include different forms of mating, such as parasitic mating. Parasitic mating occurs when the male physically ...

In the rivers of Mexico and southern Texas in the United States, a silvery-scaled fish swims that seems, according to ...

Estrogen-mimicking pollutants can trigger gender-bending effects in wildlife. For instance, male fish exposed to such hormonally active pollutants will make vitellogenin, an egg-yolk protein that’s ...

Through a series of prosocial choice tasks, researchers reveal prosocial and antisocial characteristics in male convict cichlid fish. The fish distinguish between female breeding partners, unknown ...

Most divers in Hawai‘i have never seen this adult male fish, as it usually lives at depths of 100 feet or more, until recently! A‘awa the Hawaiian hog-fish male is over 20 inches long and has burnt ...

In mosquitofish, of the genus Gambusia, male fish are smaller than females -- sometimes only half the size. Biologists had previously assumed that smaller male mosquitofish had at least some ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. The male blenny fish will occasionally eat its babies when it feels the ...

The animal kingdom has many unique names. For example, a male cat is called a Tom, and a male deer is a buck. A male pig is known as a boar. These names make it easier to tell animals apart. But what ...

The bluehead wrasse is a fish that lives in small social groups in coral reefs in the Caribbean. Only the male has a blue head – signalling his social dominance over a harem of yellow-striped females.