Flotsam is a species of manta ray appearing in the Donkey Kong series.
Donkey Kong Land
While not appearing in Donkey Kong Land, Flotsam's notable member Wild Sting made an appearance at the end of the first world being the boss in that area and the first in the game. It was the inspiration of the Flotsam species.
Donkey Kong Country 2: Diddy's Kong Quest
In the game, Flotsam is simply not a threat to Diddy nor Dixie at all as it does is simply swim back and forth or diagonally without turning. When the two monkeys come in contact with this foe, they are injured. With Enguarde's sharp bill, he can defeat the foe by stabbing it. In this game, its colors are blue and green. In the remake, it is yellow and purple.
Donkey Kong Land 2
Flotsam reappears in Donkey Kong Land 2. In the game, there is no significant changes from the semi-sequel and has exactly the same behavioral traits.