Couleuvre brune— Quebec wildlife

Storeria dekayi, commonly known as De Kay's brown snake, De Kay's snake, and simply the brown snake (along with many other snakes), is a small non-venomous species of snake in the family Colubridae. The species is native to North America and Central America.

Description

Dorsally, S. dekayi is brown to gray with a lighter center stripe bordered by small black spots; ventrally, it is lighter brown or pink with small black dots at the ends of the ventral scales. Adults usually measure less than 12 inches (30 cm) in total length (including tail), but the record total length is 19+3⁄8 inches (49 cm). On average, juveniles measured 3 inches (7.68 cm) just after being born. The dorsal scales are keeled, and it has no loreal scale. Females exceed males in snout–vent length and number of ventral scales while males exceed females in tail length, head dimensions, and number of subcaudal scales.

Habitat and range

S. dekayi is a lover of urban areas and tends to frequent cities more often than the countryside. It can also be found in areas such as wetlands, grasslands, dunes, and forests, but it is most commonly encountered where humans are found.It prefers moist habitats. Although S. dekayi is solitary, aggregations of individuals have been observed.

Diet

S. dekayi primarily feeds on slugs, snails, and earthworms. In the southern extent of its region, the snake usually preys predominantly on earthworms; however, in the northern reaches of its range, slugs are the predominant food source. It has specialized jaws that allow it to remove snails from their shells for consumption. Reports of other invertebrates (such as woodlice, mites, or millipedes) in the diet of S. dekayi are more than likely the result of accidental ingestion rather than intentional feeding, in which one of these invertebrates may have adhered to a slug or other prey item being consumed.

Reproduction

Like other natricine snakes such as water snakes (genus Nerodia) and garter snakes (genus Thamnophis), S. dekayi is a viviparous species, giving birth to live young. Sexual maturity is reached at two to three years. Females have seasonal sperm storage that allows for delayed fertilization and parturition, which synchronize birth timing with peak prey availability. Mating takes place in the spring, after snakes emerge from brumation. Field studies have shown that males use pheromone-based mate searching to find receptive females. Between 3 and 41 young are born in late summer.