Puzzles Gone Wrong: a continuing series

Once again, in the category of "unclear on the concept" puzzles, this one from Tanga.

There's a lot wrong here—the solution method has problems, I think, and the pictures are too small to make out clearly. But the real issue...well, let the author explain. In case you don't want to go look, it's an odd-one-out puzzle, and the third and fifth lines are, respectively, pictures of: a helicopter, an airplane, a kite, an eagle; mouth, nose, chin, eyes. Now, from the answer:

( In case you want to solve it )

Dude. If you know that your puzzle is ambiguous, perhaps fixing it is a good idea.