These little frogs are easily recognised by their blue colour, which is generally darker on the limbs and belly and overlaid with black spots or patches, especially on the head and back. As their name implies, poison dart frogs can release toxins from the skin that are distasteful and potentially lethal to would-be predators. Three very toxic species of poison dart frogs from Colombia and South America are utilised by Indians to poison the tips of blowgun darts. Blue poison dart frogs are active during the day and can be found hiding among boulders and debris near streams; however, they lack toe webbing and are poor swimmers, so they are never found in the water.