Synophis insulomontanus, known commonly as the mountain shadow snake, is a species of snake in the family Colubridae. The species is endemic to northwestern South America.
S. insulomontanus is found in Huánuco Region, Peru.
The preferred habitat of S. insulomontanus is forests on the Amazonian slopes of the Andes in northern and central Peru at elevations of approximately 1100-.
A nocturnal, terrestrial, and semiarboreal species, S. insulomontanus has been found foraging on the forest floor in leaf litter, and coiled in bromeliads 1m (03feet) above the ground.[1]
The diet of S. insulomontanus is unknown. Despite the allusion to fishing in one of its common names, there is no evidence that the species eats fish.[2]