The Yellow and Blue Poison Dart Frog has a slim body with a rounded snout. Yellow and Blue Poison Dart Frogs have slender legs with toes and fingers having small adhesive discs for climbing. It is the largest of the family and is over two inches long. It has no teeth. Its color, black with brilliant yellow stripes and a blue belly and legs with black spots, alerts potential predators that its skin holds a poisonous liquid which is unpleasant to the taste. They may also be colored brown-black with venally yellow and white stripes depending on the area where they are found.