Vampyrius
R. vampyrus lays its eggs in small, water-filled holes in trees during the rainy seasons, generally 0.3–1.2 m above the ground. It lays eggs mostly from July to May, producing clutches of 250 eggs or fewer. The eggs are laid in foam nests on the wall of the tree hole, where nests are usually about 30–120 cm above the ground. The larvae fall into a hollow basin filled with water. Tadpoles develop from the colorless eggs, but fertilized and unfertilized eggs are the same size. The eggs are white in color, with a thin transparent covering on the outside shell of each egg, with diameters between 0.70 and 1.29 mm. The tadpoles are long and dark-brown in color. Their tails are about three times as long as their bodies. Younger tadpoles are pale white or gray in color and they become darker over time.  The tadpoles have dark hooks on their lower jaws that look like fanged teeth.  This is the only frog or toad that has fangs like these.  There is also a hard arch on the upper jaw. The two hooks go forward. The species is named after these "fangs."