active during the night when there is rain to keep their skin moist and from drying out. However, violent rainstorms have the potential to kill H. fleischmanni, as a simple direct shot from a raindrop has been observed to kill a glass frog. Habitat and distribution Fleischmann's Glass Frogs live near fast streams, and these frogs usually inhabit forests up to 2,000 meters above sea level in Central and South America. They have a very wide geographic distribution from Mexico to Ecuador and Suriname and are one of the most altitudinal species of their genus (approximately sea level to above 1600 m). In Costa Rica, these frogs live in lowland wet forests, rain forests, and even in higher elevations. They do not like dry areas such as the northwestern lowlands, high mountains, or coasts. Of all the glass frogs in Costa Rica, Fleischmann's glass frogs are the most populous. The glass frogs are also arboreal, which means they reside in trees. These frogs tend to lay their eggs on lower branches, the bottom of leaves and near flowing water. About 18–30 eggs could be laid, and the male frog would stand guard over the eggs to protect them from predators until they hatch, and the tadpoles drop into the water. Effects of vegetation on calling sites According to some researchers, the calling site of male H. fleischmanni is sometimes found on plants with broad leaves that overhang rivers, and sometimes is found on the ventral side of horizontal (or near horizontal) leaves. These two different locations of calling sites have a large difference in how the vegetation will affect the propagation of sound. Whether male frogs choose their own calling sites because of the acoustic properties of that calling site has not yet been explained, but related studies have clarified the relationship between vegetation and sound propagation. In fact, the difference in acoustic properties of the calling sites due to the physical characteristics of the environment indeed affects the success rate of courtship and territory protection. These calls are not intended to be directional, but vegetation and many other environmental factors helps to form directional, beaming-like calls. Research has shown that frogs who have their calling site more than 0.6 meters above the ground have an increased rate of attracting mates than their counterparts below 0.6 meters. A plausible explanation for this is that higher areas are relatively more open,