Hyalinobatrachium fleischmanni, also known as Fleischmann's glass frog or the northern glass frog, is a species of frog in the family Centrolenidae. It is found in the tropical Americas from southern Mexico to Ecuador. Specifically, these frogs occur in Mexico, Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, and Panama, Colombia, and Ecuador. Notice that this and related species have often been confused with each other, and the exact distribution depends on the source. This frog tends to have green skin, pale yellowish spots, yellow fingertips and translucent skin covering its stomach. Etymology The specific name fleischmanni honors Carl Fleischmann, a collector in Costa Rica in the 1890s. Description H. fleischmanni are small and arboreal frogs that lives in lowland and mid-elevation forests of Central and South America. They call during the rainy season. Glass frogs have similarities to tree frogs. They look very close to the naked eye except glass frog's eyes point forward and are golden. During the day, these frogs camouflage themselves under leaves but above water. Male glass frogs are 19–28 mm long, while females measure from 23–32 mm long. They have a green semi-translucent color with yellow translucent hands. Their skin has dots which matches that of the leaves in the area. When confronted or approached, they tend to freeze up and not move. It is not specifically known what the glass frog eats, but it is assumed that they feed on small insects. Also known as the Northern Glass Frog, this frog's physical features include primarily green skin, which also reflects visible light typically at 400 nm to 700 nm, pale yellowish spots, yellow fingertips and translucent skin covering its stomach. A sheet of guanine stretches over several internal organs, but leaves others parts such as the liver exposed for viewing as it only covers half of the frog's underbelly. They also possess a white vocal sac that can be used to produce sounds for mating. Male frogs have a noticeable hook protruding from its spine, presumably used to fight other frogs, or defend its territory or the eggs. They are fierce fighters who will occasionally engage in a wrestling matches with other intruding frogs. The female species are slightly larger and lacks this particular feature. There have been more than 100 reported glass frogs throughout Central and South America, and 13 species can be found in Costa Rica. Adults tend to be more