This reptilian Pokémon is serpentine. It has a rattle at the tip of its tail, and is mostly purple while its underbelly, eyes, rattle, and the "bands" on it are yellow.
Ekans are able to detach their jaws to swallow large prey whole, although this makes their bodies heavy. It can also use its tongue to sense danger, and can move quietly through the grass.
Like actual snakes, Ekans will lash out with a bite when frightened by anything it sees as a threat. If one happens to be bitten by a young Ekans, they are lucky. As an Ekans, it does not possess the ability to add venom to its bite until after it evolves into an Arbok, though this last bit of information clashes with Ekans's dungeon phrase.
Ekans live in grassy savannas and plains. It also inhabits cemeteries. It is found in Kanto and Johto.