Pseudis paradoxa, known as the paradoxical frog or shrinking frog, is a species of hylid frog from South America. Its name refers to the very large—up to 25 cm (10 in) long—tadpole (typical of the genus Pseudis), which in turn becomes an ordinary-sized frog, only about a quarter of its former length. Pseudis paradoxa is green coloured with dark green or olive stripes. It inhabits ponds, lakes and lagoons from northern Argentina, through the Pantanal, Amazon and the Guianas, to Venezuela and Trinidad, with a disjunct distribution in the Magdalena River watershed in Colombia and adjacent far western Venezuela. The female frog lays eggs among water plants; the eggs develop into giant tadpoles.