My fault, pushed the wrong button. It's not possible, and the threads are stupid and doesn't solve the problem. I wanted to change the " solved", but I couldn't. Anyway, what you wrote is true. Impossible level!! Thanks for your Explanation, so I don't have to be angry with Marc.
@Marc: Why is this question solved? You did not even looked at this Level, right? 8 black sheeps, each of them needs at least 2 moves to finish. But you've only 16 moves and you can't start with a sheep-move. So you need 15 moves with one sheep and at least one perfect move where you need to finish with two sheeps. Perhaps…