This fascinating color palette also belongs to some incredible species, as you’ll ... stark blue tail fins. Guppies are tiny, easy-care fish that grow up to 1.6 inches (4 centimeters) long.

There are at least 40 known species of flying fish. Beyond their useful pectoral fins, all have unevenly forked tails, with the lower lobe longer than the upper lobe. Many species have enlarged ...