Nibblas are carnivorous fish enemies found in a few levels of Donkey Kong Country 3: Dixie Kong's Double Trouble.
Nibblas are similar to Snapjaws an enemy from Donkey Kong Country 2: Diddy's Kong Quest. Like Snapjaws Nibblas will follow the Kongs throughout a level ready to chomp down on either Dixie or Kiddy Kong if they fall into the water. Nibblas mostly appear in levels that have boardwalks in them. Also like Snapjaws, Nibblas are completely invulnerable and cannot be harmed.
Additionally, an unnamed Nibbla is a "sort-of" Animal Buddy who follows Kiddy Kong and Dixie Kong through level "Fish Food Frenzy" as a friend to the Kongs — so long as the player keeps him well-fed (although in any other level, he is an enemy only). If Kiddy and Dixie continually feed Nibbla Kocos, he will remain blue, smiling contently as he follows the Kongs throughout the level. However, if the Kongs feed Nibbla one of the many spiny-shelled Lurchins scattered throughout the level, or simply fails to feed him enough, his mood will gradually worsen until he finally satisfies his hunger by attacking a Kong.
Nibbla's status as an animal buddy is debatable, as his feeding requirements act much like an obstacle and inconvenience. However, for his help in clearing enemies from the level, he may be considered "partly" an animal friend, infact one of the games Bonus Barrels is only reachable with Nibbla's aid. Also of note, there is a "No Nibbla" sign at the end of "Fish Food Frenzy", but no reward is given when bringing Nibbla past it.