oscar (astronotus ocellatus) and mata mata (chelus fimbriata).

actinopterygii amazon america american animal animals aquarium astronotinae astronotus brazil chelidae chelinae chelus cichlid cichlidae fauna fimbriata fish fishes fresh freshwater lake life marble mata matamata natural nature ocellatus one orinoco oscar perciformes pleurodira pond reptile reptiles reptilia river south swim swimming testudines tiger turtle turtles underwater velvet water wild wildlife