|Coloured flying bats|
Flying bats appear as either green or pink spheres which wear a mask and have teeth, and two wings attached to their spherical body.
Coloured flying bats can only be killed with the same coloured head. As with all enemies in Knuckleheads, hitting a coloured bat with the opposite coloured head will subtract one heart the angry heads. Flying bats are the first enemies introduced in Knuckleheads, and are one of the most common.
They fly either vertically or horizontally in one direction, and can only be killed if they are hit by one of the moving heads of the player, bats remaining unharmed if they fly into the right coloured head that is still and not moving. A killed bat will have its wings will drop off and its spherical body plummet into the lava.