Crawltons (ザキーン,Zakin?) are Badniks that resemble a centipede and are created by Doctor Robotnik. Crawlton's first game appearance has been in Sonic the Hedgehog 2, where it can be found hiding and quickly attacking its target from walls.
Sonic the Hedgehog 2
In Sonic the Hedgehog 2, these Badniks can be found at Mystic Cave Zone, hiding within the walls and waiting the player to come closer. It starts attacking quickly surging from above or below toward, which can hurt the player.
Before the conformation, the player is able to see Crawlton's head or parts of its body being visible within the walls, which reveals the Badnik's whereabouts. Sometimes Crawltons can easily be avoided while moving fast or Badniks don't have enough of its body to achieve its target. Crawltons can be defeated by simply Spin Jumping on its head after revealing itself.
Sonic Lost World
Numerous years later, Crawlton Badniks make an appearance in Sonic Lost World, where they are featured at Desert Ruins, Tropical Coast and Frozen Factory. During the game, it turns out that Badniks, Crawltons included, got hijacked by the Deadly Six. In Wii U version of the game, they can be seen hiding on small bushes of the desert, while most of time, they can be seen attacking on groups as well. They wander below sandy areas and when the player gets close to them, they will pop out the sand in a swift motion to damage Sonic.
In the Nintendo 3DS version of the game, Crawlton Badniks are larger with taking multiple hits. If the player has to progress in the Zone, he has to destroy Crawlton, similar to Sandworms in the game. Crawltons pop out the hole in wide arena, trying to hit the player, who has to do Somersault on him to stun Badnik. The player has to then hit to the lower, glowing weak spot by doing Homing Attack on it three hits to defeat. Before the last hit, overheating Crawlton has different pattern as making himself swing around.
Crawltons seem to be successors or just sharing design similarities with Caterkiller from original Sonic the Hedgehog. These Badniks have eight round-shaped segments, including its head. It is colored above dark blue while bottom section is mostly yellow. Each segment has two yellow spikes, one each side. The head section has eyes, two pointy antennas on top of its head, two long scissor teeth and two plates on each side of its "ear" sections. Crawltons are seen sort of small mouth between scissor teeth.
Crawltons hide within the walls. When the player comes near, it pokes itself out of its hiding place for a surprise attack. It can only be attacked on its head due to the harmful spines on its body, which can also hurt the player.
In the Sonic the Comic series published by Fleetway Editions, the Crawltons are a part of Dr. Robotnik's Badnik army. Depending on the artist, the Crawltons' design would be altered slightly various times. They were sort of recurring Badnik types early on in the comics, but appear more scarcely as time went on.