Ekans

Ekans (アーボ) is a snake-like Pokémon that swallows whole the eggs of small bird Pokémon such as Pidgey or Spearow. Its highly poisonous fangs make it a hazard in the wild. Ekans also shares other characteristics as snakes, such as using its tongue to test the air for the presence of prey, and shedding its skin. Ekans's purple color suggests the presence of poison, though in the first three games it looked like an aerage green snake

The name Ekans is the word snake] spelled backwards. Ekans' Japanese name, Arbo, is a reversal by morae of the word boa. Ekans' name in the English beta version was also Arbo.

In the anime, the most notable Ekans was owned by Jessie, who had received it before episode 1 on her birthday. It later evolved into an Arbok and was set free.