Swoops, originally called Swoopers, are bats that first appeared in Super Mario World and since then, Swoops have become recurring enemies, appearing in several other games, including main-stream and spin-off ones. A similar species known as Buckies also appears in Donkey Kong: Jungle Beat.
In Super Mario World, Super Mario 64, New Super Mario Bros., Super Paper Mario, New Super Mario Bros. Wii, New Super Mario Bros. 2, and New Super Mario Bros. U, they hang idly on the ceiling and when the player's character comes near, they fall and fly towards the player, hurting the heroes on contact.
In Super Mario World, Swoops hang from the ceilings of caves upside down, waiting for Mario or Luigi to approach. When they come near, the Swoops fly down and try to hurt Mario or Luigi. They can easily be defeated by with a stomp. They are mainly found in Vanilla Dome.
Swoops were originally going to be blue in this game, but they became green in the final version. However, their blue colour scheme would later carry over to all other Mario games after this game.
Super Mario 64
Swoops (called as such for the first time) also appear in Super Mario 64 and its DS remake. They are found only in Hazy Maze Cave, these Swoops are recolored from green with brown wings to blue with purple wings, which would go on to be their color scheme in future appearances. Like in Super Mario World, they hang still on the ceiling waiting for Mario to come, then fall off the ceiling and flutter in place briefly before dashing towards its victim.
New Super Mario Bros.
Swoops appear in New Super Mario Bros., like in Super Mario 64, they hang on the ceiling waiting to attack. A rare one appears in World 2-3 whereas the other 12 appear in World 5-2. They are blue and have purple wings which mostly resembles their design in Paper Mario.
Super Mario Galaxy
Swoops appear in Super Mario Galaxy. These bats are brown in this game, have a similarity to Keese from The Legend of Zelda series, and cling to the ceiling or appear flying. If Mario approaches, they will lock-on and charge at him. Swoops could be defeated by a jump or a spin, and give a Coin or three Star Bits depending how they are defeated. If a Swoop hits Mario, it will laugh at him and taunt him. There is also a cyan ice variation called Ice Bats that will freeze Mario for a few seconds when contacted, which is also akin to Ice Keese in The Legend of Zelda series. Attempting to attack them with a Jump will make Mario frostbitten, causing him damage. The only way to defeat them is to use fireballs as Fire Mario (or Fire Luigi) since Spinning an Ice Bat will not kill it. It also taunts and laughs at Mario due to its ice protection. Ice Bats only appear in the Freezeflame Galaxy.
Ordinary Swoops from Super Mario Galaxy reappear in Super Mario Galaxy 2, and behave the same way as they did in the first game. They appear in galaxies such as the Slimy Spring Galaxy and the Fleet Glide Galaxy but are rare enemies. Ice Bats do not appear in this game. The Prima Guide refers to them as Bats.
New Super Mario Bros. 2
Swoops reappear in New Super Mario Bros. 2 behaving exactly as they did in the previous games. They only appear in World 5-.