Dyeing poison dart frog
For some time, scientists thought this frog was two species: Dendrobates azureus and Dendrobates tinctorius.  Now they know it is one species that can be two different colors.  These two types of frog in the same species are called morphs.  The blue color morph (azureus) is bright blue-black legs and back, light blue sides, a light blue belly with spots, and spots on its head and back.  Sometimes it has a dark stripe on its belly.  The other morph has yellow color on its body.  The adult male frog has bigger disks on its toes for climbing than adult female frogs have.   Both frogs are poisonous, but the blue frogs have more poison than the yellow ones.