The Nelson's Milksnake (Lampropeltis triangulum nelsoni) is a type of king snake

King Snake

King Snake is a fictional character who appears in books published by DC Comics universe, usually as an adversary of Tim Drake and Batman. Created by writer Chuck Dixon and artist Tom Lyle, King Snake first appeared in Robin #2...

 that is found in Mexico from southern Guanajuato

Guanajuato

Guanajuato officially Estado Libre y Soberano de Guanajuato is one of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico. It is divided in 46 municipalities and its capital city is Guanajuato....

 and central Jalisco

Jalisco

Jalisco officially Estado Libre y Soberano de Jalisco is one of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico. It is located in Western Mexico and divided in 125 municipalities and its capital city is Guadalajara.It is one of the more important states...

 to the Pacific Coast

Pacific Coast

A country's Pacific coast is the part of its coast bordering the Pacific Ocean.-The Americas:Countries on the western side of the Americas have a Pacific coast as their western border.* Geography of Canada* Geography of Chile* Geography of Colombia...

. It is also found on the narrow plains of northwestern Michoacán

Michoacán

Michoacán officially Estado Libre y Soberano de Michoacán de Ocampo is one of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico. It is divided in 113 municipalities and its capital city is Morelia...

 and on the Tres Marias Islands. The range of this snake appears to be tied to the proximity of watercourse

Watercourse

A watercourse is any flowing body of water. These include rivers, streams, anabranches, and so forth.-See also:* physical geography* Environmental flow* Waterway* Hydrology* Wadi-External links:...

s, including ones utilized for irrigation

Irrigation

Irrigation may be defined as the science of artificial application of water to the land or soil. It is used to assist in the growing of agricultural crops, maintenance of landscapes, and revegetation of disturbed soils in dry areas and during periods of inadequate rainfall...

 and agriculture

Agriculture

Agriculture is the cultivation of animals, plants, fungi and other life forms for food, fiber, and other products used to sustain life. Agriculture was the key implement in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that nurtured the...

. It is a subspecies

Subspecies

Subspecies in biological classification, is either a taxonomic rank subordinate to species, ora taxonomic unit in that rank . A subspecies cannot be recognized in isolation: a species will either be recognized as having no subspecies at all or two or more, never just one...

 of the milksnake, Lampropeltis triangulum. It is similar in size to other king snake

Snake

Snakes are elongate, legless, carnivorous reptiles of the suborder Serpentes that can be distinguished from legless lizards by their lack of eyelids and external ears. Like all squamates, snakes are ectothermic, amniote vertebrates covered in overlapping scales...

s, averaging 42 inches (106.7 cm) long, and like them, is nonvenomous.

This species is named in honor of Edward W. Nelson who worked for the U.S. Biological Survey from 1890, becoming chief in 1916.

Characteristics

Size: Adults average 42 inches (106.7 cm) long.

Habitat: Semi-arid coastal thorn scrub and interior tropical deciduous forests.

Prey: Nelsons are opportunistic feeders. They will eat birds, small rodent

Rodent

Rodentia is an order of mammals also known as rodents, characterised by two continuously growing incisors in the upper and lower jaws which must be kept short by gnawing....

s, lizard

Lizard

Lizards are a widespread group of squamate reptiles, with nearly 3800 species, ranging across all continents except Antarctica as well as most oceanic island chains...

s, amphibian

Amphibian

Amphibians , are a class of vertebrate animals including animals such as toads, frogs, caecilians, and salamanders. They are characterized as non-amniote ectothermic tetrapods...

s, and other snakes, including venomous species

Venomous snake

"Poisonous snake" redirects here. For true poisonous snakes, see Rhabdophis.Venomous snakes are snakes which have venom glands and specialized teeth for the injection of venom...

. It has a natural tolerance to the venoms of many native snakes.

Appearance

The snake has 13 to 18 red rings and commonly has a dark-flecked light snout (in rare cases, the snout is mostly black). While the red bands are quite wide, the black ones are noticeably thinner, and the white is very thin. There is practically no black tipping on both the white and the red scales. Albinism

Albinism

Albinism is a congenital disorder characterized by the complete or partial absence of pigment in the skin, hair and eyes due to absence or defect of an enzyme involved in the production of melanin...

 and pattern aberrancies are established. It has 19 to 23 rows of smooth scales and a single anal plate.

Until noted by Williams

Kenneth L. Williams

Kenneth Lee Williams is a herpetologist and author of books on the subject of snake biology and classification. Williams retired from teaching in the Biology department of Northwestern State University and received emeritus status in 2001...

 in 1978, it was not recognized that the L. t. sinaloae

Lampropeltis triangulum sinaloae

The Sinaloan milk snake is an egg laying species of non-venomous colubrid snake. It is one of the most commonly bred milk snakes in captivity. It is a fairly docile species and will rarely bite. If handled, it will discharge a pungent smelling exudate from the cloaca as a warning...

, or Sinaloan Milksnake, found near Mazatlán

Mazatlán

Mazatlán is a city in the Mexican state of Sinaloa; the surrounding municipio for which the city serves as the municipal seat is Mazatlán Municipality. It is located at on the Pacific coast, across from the southernmost tip of the Baja California peninsula.Mazatlán is a Nahuatl word meaning...

, Sinaloa

Sinaloa

Sinaloa officially Estado Libre y Soberano de Sinaloa is one of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico. It is divided in 18 municipalities and its capital city is Culiacán Rosales....

, Mexico, is a subspecies of milksnake distinct from the less common L. t. nelsoni.