Swamp Kings
These creatures look remarkably like what a miniature T-Rex would have back in prehistoric times, assuming that it it had been covered in blue-green feathers. These creatures have clearly adapted to a freshwater aquatic life, with a waterproof coat and webbed feet. Swamp Kings will eat a lot of things, but they particularly like to eat giant snakes (which they can, and usually do). Swamp Kings, thankfully, do not fly. They might also be getting bigger ever year.