From the Super Mario Wiki
Raven chicks are small Ravens that appear in Super Mario World 2: Yoshi's Island and its remake, Yoshi's Island: Super Mario Advance 3. When Yoshi eats them, they are automatically digested without being turned into a Yoshi Egg. Like the larger adults, Ravens can climb walls and ceilings. Ravens return in Yoshi's New Island, where they are only found in Eggstraordinary Terrain. Unlike previously, Yoshi can lay an egg if he eats one.
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