The way guppy fish behave suggests they can be tricked into believing holes are larger or smaller than they really are – but they don’t always interpret the optical illusions in the same way ...

Some Fish Are Braver Than Others: Guppies Have Complex Personalities Under Stress. Published Sep 25, 2017 at 12:30 PM EDT Updated Sep 25, 2017 at 12:50 PM EDT.

Guppies are a small, pretty species of fish that are extremely popular for home aquariums. While they’re fun in captivity, in the wild they can cause major trouble.

An international team of biologists, led by Wageningen University & Research, has demonstrated that predators have a direct ...

In other words, the guppies were going through a fish version of menopause. David Reznick, a biologist at UC Riverside, and colleagues compared the life history of 240 guppies taken from mountain ...

Guppies have silver eyes, but when they’re ready for a fight, their irises go dark. ... Those dots are the eyes of small, inch-long fish called guppies. And those guppies are angry.

The fish themselves cost as little as $0.10 each at pet stores (or as much as $25 for fancy guppies), the flaked food they require is inexpensive, and if you pick up a used tank and filter, you ...

For aquarium enthusiasts looking to add a touch of the extraordinary to their tanks, there’s a world of unusual fish species ...

Use precise geolocation data and actively scan device characteristics for identification. This is done to store and access ...

A large group of yellowfin tuna swimming off the coast of Italy. Like all fish, they sleep, but it’s not like human sleep. Giordano Cipriani/The Image Bank via Getty Images Michael Heithaus, Florida ...