There are various species of frogs in this world, but one of the most surprising and strange specie is glass frog that belongs to Centrolenidae family of amphibians. The name “Glass Frog” is the depiction of crystal appearance of this frog with lime green background color.
However, there are also such frogs lie in this family that are characterized by translucent abdominal skin. Thanks to such skin membrane, the internal body parts of this frog such as liver, heart and intestinal system can be seen clearly. With respect to size, glass frogs are not very big with average length just 1-3 inches. The major distinction of glass frogs from its other species is the very cruel fact that is eating their little young. The green color of upper part and translucent lower body make the amazing combination that mesmerizes the viewers.
In terms of structural appearance, there is no such a great difference in glass frogs and other frogs especially the members of genus Eleutherodactylus. In fact, these frogs have much resemblance with Hylid tree frogs that belong to Hylidae family. The only difference between these two frogs is that, the glass frogs have face forwarded eyes while the hylid frogs have face sided eyes. The interesting thing is that, there are some species of hylid green frogs that even comprise the transparent abdominal skin just like the glass frogs. These species are Hypsiboas pellucens and Hyloscirtus palmeri. Here, it becomes very difficult to distinguish between glass frogs and green tree grogs. However, the translucent species of green tree frogs have calcars at their heels. This is the only feature that differentiates them with the glass frogs.
Glass frogs are not limited to some specific climate and geaographic area, but they can be seen over a large span of earth that starts from southern Mexico to Panama and goes towards the island of Tobago to Bolivia by crossing the Andes from Venezuela. There are also some species of glass frogs that are present in the Amazon and Orinoco River basins, southeastern Brazil, the Guiana Shield region and northern Argentina.
The typical arboreal nature of glass frogs make them fit for survival along the rivers and streams especially for the period of the breeding. The eggs are generally set down on the shrubs or leaves of trees that are hanging down over the running water of streams or small rivers. A highly strange act performed by one species of glass frogs is that, it leaves its eggs over stones close to waterfalls. In fact, the egg-laying technique differs between species of glass frogs.