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. 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.