Trimeresurus stejnegeri is a species of venomous pit viper endemic to Asia. Trimeresurus popeiorum is a species of venomous pit viper in the family Viperidae. Two are venomous&colon; the meadow viper and the Siberian pit viper. Lachesis stenophrys is a venomous pit viper species endemic to Central America. Crotalus mitchellii is a venomous pit viper species in the family Viperidae. Lachesis melanocephala is a venomous pit viper species found in Costa Rica. Crotalus basiliscus is a venomous pit viper species in the family Viperidae. Ovine-derived antivenom, CroFab, for North American pit viper envenomation has been widely available since 2001. Lin referred to her as a "long-nosed pit viper". Other snake species include the paradise tree snake and Wagler's pit viper. Crotalus durissus is a highly venomous pit viper species found in South America. The region is also home to at least one endemic pit viper, "Trimeresurus elegans". Pollution and the destruction of rainforests have caused many pit viper populations to decline. Crotalus concolor is a venomous pit viper species found in the western United States. Trimeresurus insularis is a venomous pit viper subspecies found in Indonesia and East Timor.