RUSTBURG, Va. - Bill Carwile knows what makes a good guppy. One of seven senior judges for the International Fancy Guppy Association and a best-of-show winner many times over, Carwile has 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.

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 ...