Flip-Flap

Flip-Flaps are a species of bat-like creatures that have acted as recurring enemies in the series since their debut in Donkey Kong 64.

Donkey Kong 64
Flip-Flaps first appeared in Donkey Kong 64, in Fungi Forest and Creepy Castle. Zingers replace them during the day portion of Fungi Forest. They are easy to defeat, and their attack is simply diving into the Kong.

DK: King of Swing
Flip-Flaps make a reappearance in DK: King of Swing as enemies that flap around and try to attack Donkey Kong. They mainly reside in cave-like areas.

Donkey Kong Barrel Blast
In Donkey Kong Barrel Blast, Flip-Flaps make a reappearance as an obstacle in Mt. Dynamite.

DK: Jungle Climber
Flip-Flaps make their most recent appearance in DK: Jungle Climber as enemies that mainly appear in eerie forests.

Trivia

 * Prior to their debut, an unnamed bat-like enemy appeared in the original Donkey Kong for the Game Boy, these enemies could be considered the predecessors to Flip-Flaps.