From the Super Mario Wiki
Smooch Spider are yellow spiders with large lips that first appear in Yoshi's Woolly World. They attempt to hurt Yoshi by pulling the web Yoshi's on and then they try to kiss him to hurt him, or if Yoshi makes contact with it he will get hurt. Even though they cannot be defeated, they can be stunned by throwing a Yarn Ball at it.
Smooch Spiders only appear in the course, Lair of the Smooch Spiders.
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