Mecha Hiyoko

Mecha Hiyoko (or Mecha Chick) is a variety of Badnik created by Dr. Eggman, encountered by Sonic and Tails in several 8-bit adventures: Sonic the Hedgehog 2 (8-bit), Sonic Chaos, and Sonic Triple Trouble. These silvery, bullet-shaped bird-bots move quite slowly by hopping after Sonic. In Sonic 2 they appear only as part of the boss fight against the Goose Mecha in Sky High Zone. Sonic Chaos sees them hop around in triplet groups within Aqua Planet Zone, and also form an integral part of the Sphere-o-Bot boss. In Triple Trouble's Atomic Destroyer Zone they are present only during the main level, seen hoping right out of the badnik-generators en masse when Sonic accidently pushes the activation button. Like other robots in 8-bit Sonic games, no animal friends pop out of Mecha Hiyokos when they are destroyed. Whether these badniks canonically don't contain organic batteries, or the escaping critters simply weren't shown due to programming limitations, is not known.