Slug

A Slug is an animal in the Real World and a colorful creature that appears in Yoshi's Story. Slugs look like they are covered in pink sludge or paint. They also have two bulging eyes. In Page 2: Cavern, Yoshi can go into a pot, and enter a room with a few Slugs crawling up, down, and horizontally on the walls. Slugs also appear in Stage 6-4: Magma Castle. It is difficult to defeat Slugs in combat. Many eggs are required to destroy a single Slug. However, once Yoshi does destroy the Slug, he will get a special prize.

Slugs are one of the few mini-bosses in the game.