From the Super Mario Wiki
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When a Sour Dodo spots the Kongs, it starts charging towards them in an effort to attack, similar to Rawks from Donkey Kong Country Returns. Until then, the Sour Dodo only walks back and forth at the same pace as a Dozy. The player can attack them using any method, such as jumping on their heads, rolling into them, or tossing an object onto them. Ground pounding near a Sour Dodo stuns it for a moment. If Diddy Kong, Dixie Kong, or Cranky Kong fire their popguns on a Sour Dodo, the creature stops for a brief period before continuing to stroll.