Pseudis or the swimming frogs are a genus of frogs that live in South America. They are in the family Hylidae. They are important because they have the largest tadpoles of any frog in the world. The adult frogs are not much bigger than other frogs, but the tadpoles are giant. Human beings hear these frogs more than they see them. This is because the frogs sing loud but blend into the water and plants so they are hard to see. The frogs live in lakes, ponds, marshes, and other bodies of waters that have many plants in them. These frogs sit near the top of the water, hiding in the plants or on floating plants. This frog will dive into the water if they see something that looks dangerous to them.