Trinidadian guppy fish have varying levels of self-control, scientists have found (University of Exeter/PA) Just like humans trying to stick to New Year’s resolutions, guppies have varying levels of ...

Death doesn't stop some animals from becoming parents, research reveals. A new study shows that female Trinidadian guppies can store and use sperm from males long after the males die. Up to a quarter ...

Male guppies may sexually harass females of another fish species to prevent them from reproducing, researchers suggest. They believe the guppies – which have invaded Mexican rivers and lakes – are ...

In the animal world, sexual reproduction can involve males attempting to entice or force females to mate with them, even if they are not initially interested. This male behaviour is driven by ...

There are no potential conflicts between the author of this article and any parties related to the research being reported or the journal in which the study was published. All organisms have been ...

Guppies can be fooled by optical illusions into believing objects are smaller or larger than they really are. This suggests they might not always make the best choices in their natural environment.

TORONTO, ON – Some males will go to great lengths to pursue a female and take extreme measures to hold on once they find one that interests them, even if that affection is unrequited. New research ...

Gravid and barren Daphnia pulex were exposed to a variety of predators in laboratory aquaria. Small fish (guppies, sticklebacks and shiner fry) consistently preferred the gravid females, establishing ...

The law of unintended consequences gained new appreciation today when a five-year international study was published in the Journal of Animal Ecology detailing how long-term exposure to pharmaceutical ...

Striking colors that are seen only in the males of some species are partly explained by gene behavior, research into guppy fish suggests. Striking traits seen only in males of some species -- such as ...

When Robert Heathcote dips his head into the rivers of Trinidad, he’ll often see little black dots moving through the water, even when it’s murky. Those dots are the eyes of small, inch-long fish ...