Magma Cube

LAVA SLIMES are a hostile mob found around The Nether. When killed, they leave smaller versions of themselves, then dying and leaving Experience Orbs. When they move, they jump up and momentarily unravel into several layers, giving them the appearance of a spring and revealing a molten lava core inside.

Trivia

 * Lava Slimes can not jump out of lava if the lava is too deep.

Адский слизень