Ekans

“Moves silently and stealthily. Eats the eggs of birds, such as PIDGEY and SPEAROW, whole.”

— Pokémon Red

“The older it gets, the longer it grows. At night, it wraps its long body around tree branches to rest.”

— Pokémon Yellow

“It can freely de­ tach its jaw to swallow large prey whole. It can be­ come too heavy to move, however.”

— Pokémon Gold