Thorn

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Thorns are spiky obstacles found in Super Mario World 2: Yoshi's Island and its sequel Yoshi's Island DS, they are found mostly in castles. Contact with them will immediately kill a Yoshi, making them very dangerous. Luckily, a Yoshi Egg will destroy a single thorn, though since thorns are usually found in groups and Yoshi can only carry six Yoshi Eggs at a time, most thorn groups are impossible to completely destroy.