Prehistoric Pride

Killer Kangaroo versus Demon Duck of Doom.

So, any bets on who would win?

I'm going to immediately throw my weight behind who would seem to be the underdog, or that poor Duck of Doom, who has to deal with a much larger creature with powerful legs and crushing teeth. They were large birds, so maybe they couldn't fly, but if they could then there's one obvious advantage. If there's water nearby and they were enough like ducks to swim, there's a second advantage.

And if nothing else, a few well-aimed snaps at the kangaroo's legs and Doom Duck could easily put him out of commission.