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Lachesis stenophrys
Lachesis stenophrys is a venomous pitviper species endemic to Central America and northern South America. The specific name, stenophrys, is derived from the Greek words stenos, meaning "narrow", and ophrys, meaning "brow" or "eyebrow". No subspecies are currently recognized. Adults commonly grow to more than 200 cm (6 feet 6¾ inches) and may exceed 330 cm (10 feet 10 inches) in total length.
Seen in the Reptile exhibition at the InBio Park in Santo Domingo, Heredia, Costa Rica. Occurs in tropical rainforest and lower montane wet forest where annual precipitation averages 2,000-4,000 mm, which is heavy to extremely heavy rainfall. In the drier areas of Nicaragua, it can be found in gallery forests as well as forests that are seasonally dry, but then never far from sources of water. This species is hardly ever encountered outside of old growth forest.
bayucca is right. I believe they refer to it as L. stenophrys.
Great spotting! beautiful snake
thanks bayucca... oh ho, another one. I'll stop posting for a little while so you can get to bed!!
Please, verify. I cannot see the head very clearly.
http://www.inaturalist.org/taxa/Lachesis...
May also be called Lachesis stenophrys.