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.

From Trinidad’s rivers to backyard ponds, guppies have captivated scientists for over a century. This experiment recreates their world with sand, filters, and mangroves, showing how these tiny fish ...

Add Yahoo as a preferred source to see more of our stories on Google. At first glance, a pet fish is a piece of cake. Yes, they are very chill pets compared to dogs and cats, but setting up their ...

Some pet tropical fish are naturally placid, while others are fearsome predators.