Spina

Spinas are robots from Sonic Adventure. They resemble blue bats with blades for wings, and they could possibly be next-generation Bat Brains. They float around and move torwards the player when approached. Hitting their sides is impossible because of the blades, so the player must jump on their head to destroy them. Similar enemies are the Electro-Spina which generates an electric shield to protect itself, and the Spiky Spina, which is plated with spiky armor. Spinas also appear in Sonic Advance 3, where they are purple.