In Daniel 7, which beast had four wings like those of a bird and four heads?

Answer: The leopard

The third beast was like a leopard, with four wings like those of a bird on its back and four heads, and it was given authority to rule.

“Next, as I watched, suddenly another beast appeared. It was like a leopard, and on its back it had four wings like those of a bird. The beast also had four heads, and it was given authority to rule.”— Daniel 7:6 (BSB)