Northern leopard frog (Lithobates pipiens or Rana pipiens).
Although these carnivorous frogs primarily eat crickets, flies, worms and smaller frogs, they are also known to eat birds and garter snakes. They can lay over 60,000 eggs in breeding ponds that can support their tadpoles. Starting in the 1970s the massive population of these frogs began declining. The suspected causes include pollution, water acidity, deforestation, habitat fragmentation, introduced fish, and disease.