Whelgon

The whelgon slit from its ancestor the great tregon. The whelgon has grown twice the size of its ancestor and has adopted a very strange behavioral adaptation; it beaches itself on Yokto Island and eats any islepedes that come along. The whelgon uses echolocation to find the islepedes. It has also developed primitive lungs to help it to stay out of water, but it cant stay more than 4 hours, or else its skin dries up. It also has immense trouble moving on land and must flop around pathetically.

The spots on the whelgons skin help them camoflaugue in the brown soil of Yokto Island, but it has also become a sexual dimorphism. Spots that are lighter than the skin are one sex, spots that are darker than the skin are another, and the last sex has no spots, but darker skin.