From the Super Mario Wiki
Swooper Doopers are avian enemies appearing in Donkey Kong Country: Tropical Freeze. They resemble white flamingos with red feathers on their small wings and tails. They wear a tribal mask, accompanied by a crown of red feathers which is arched around their head. Their name is a pun on the phrase "super duper", used to describe something glorious or very impressing.
Much like their name describes, Swooper Doopers attack by swooping repeatedly from side to side. They can damage the Kongs if they fly into them, causing them to lose a heart from their health meter. Swooper Doopers can be defeated in any manner, including a jump attack, a roll attack and an object throw.
Swooper Doopers are among the enemies native to Bright Savannah. They can be found in every level of this world, except for Twilight Terror and Triple Trouble. Additionally, although present in Cannon Canyon, Swooper Doopers only act as background elements, with one being seen standing on a cliff and watching the Kongs shooting from a Barrel Cannon.