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Birds are Nitpicker-like toys that debut in Mario vs. Donkey Kong. In Donkey Kong Jungle, they routinely perform their traditional flight pattern from their nests and lay eggs when above Mario; in Fire Mountain, they are replaced by Firebirds.
They appear again in Mario vs. Donkey Kong 2: March of the Minis, more clearly depicted with metallic-looking joints under their wings. They appear in the Jungle Hijinks battle with Donkey Kong. Their main purpose is to serve as an obstacle to the Mini Marios and swoop down on them if they are underneath it. Every time Mini Marios hit Donkey Kong, the Bird will start dropping eggs on them. Mini Marios can drop a banana on the Bird to temporarily destroy it.
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