The Galápagos racer (''Pseudalsophis biserialis'') is a
colubrid
Colubridae (, commonly known as colubrids , from la, coluber, 'snake') is a family of snakes. With 249 genera, it is the largest snake family. The earliest species of the family date back to the Oligocene epoch. Colubrid snakes are found on ever ...
snake in the genus ''
Pseudalsophis
''Pseudalsophis'' is a genus of snakes in the family Colubridae. The genus is endemic to South America.
Geographic range
Species in the genus ''Pseudalsophis'' are found in Ecuador (particularly the Galápagos) and Peru.
Species
Seven species ...
'' that is endemic to the
Galápagos Islands
The Galápagos Islands (Spanish: , , ) are an archipelago of volcanic islands. They are distributed on each side of the equator in the Pacific Ocean, surrounding the centre of the Western Hemisphere, and are part of the Republic of Ecuador ...
. It is a mildly venomous constrictor but it is not considered aggressive or harmful to humans. The two
subspecies
In biological classification, subspecies is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics (morphology), but that can successfully interbreed. Not all species ...
are the eastern and western racers, the latter being larger, longer, and darker than the former. The western subspecies specializes in hunting fish, while both subspecies eat small reptiles, eggs, rodents, and bird hatchlings. The Galapagos racer is
near threatened
A near-threatened species is a species which has been categorized as "Near Threatened" (NT) by the International Union for Conservation of Nature as that may be vulnerable to endangerment in the near future, but it does not currently qualify fo ...
due to recently
introduced species
An introduced species, alien species, exotic species, adventive species, immigrant species, foreign species, non-indigenous species, or non-native species is a species living outside its native distributional range, but which has arrived there ...
that feed on snake eggs, including pigs, rats, mice, and cats.
It is one of only three species of snakes on the Galápagos Islands, and it was first described in 1860. In November 2016, a video clip from the
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in 1860, this species has been renamed numerous times since then.
'', ''Orpheomorphus'', and ''Oraphis''.