Whisp
From Sonic Retro
Found in groups of three, whisps (called Punpun in the Japanese Manual) fly around Sonic and try to swoop down on him. Simply just use the spin attack jump to destroy them, as they aren't really too troublesome.
36924 Whisp sprite offset
89534
Whisp sprite art (Nemesis Format, 9 blocks)
8C
Sprite function