
They become more docile with regular handling. They can be flighty and will typically defecate when initially handled, though they will rarely bite. King snakes and milk snakes must be housed separately (except during the breeding season) because they are cannibalistic. Cages should be escape-proof and fresh water provided at all times. Temperature control is important, as it maintains the animal's feeding response and digestion. Sinaloan milk snakes adapt well in captivity if kept between 80 and 85 degrees Fahrenheit, with a nighttime temperature drop of 5 to 10 degrees. Like other members of the king snake family, the Sinaloan milk snake sometimes eats other snakes and does have at least some immunity to their venom. The female lays an average of 5-15 elongated eggs beneath rotting wood, boards, rocks and rotting vegetation. The brumation period is between November to February. The Sinaloan milk snake mates from early May to late June, sometimes twice a year. Nevertheless, the diet of an adult milk snake still primarily consists of rodents. Fresh water should be supplied once daily in a shallow bowl. They have been known to consume a variety of animals including rodents, eggs, birds, reptiles, amphibians and invertebrates. It is illegal and unethical to offer snakes live vertebrate food. Milk snakes are much more opportunistic eaters than fox snakes or corn snakes. Like other milk snakes, the Sinaloan milk snake is nocturnal and feeds after dark and at night. In areas close to urbanization, they are also found in barns and under piles of wood. They are often found during the day resting beneath loose rocks, in rock crevices or beneath cactus plants. The Sinaloan milk snake inhabits the dry, arid and rocky semi-desert regions in southwestern Sonora, Sinaloa and southwestern Chihuahua, Mexico. Like other milk snakes, the Sinaloan milk snake is very agile. Fully grown adults can reach a length of approx. The head is black with a cream-colored band just behind the eyes across the top of the head.

The Sinaloan milk snake is easily distinguished from other subspecies because of the very broad bands of red which are much more prominent than in most other subspecies (far wider than the black bands). The red rings are bordered near the edge of the ventrals by black pigment, leaving the center of the triad (on the ventral side) with a creamy white. The Sinaloan milk snake is predominantly blood red with distinct rings or bands of black which have thinner cream-colored, whitish, or (rarely) light cream-yellow bands within the black bands. The Sinaloan milk snake inhabits the rocky and semi-arid drylands of southwestern Sonora, Sinaloa, and southwestern Chihuahua ( Mexico). However, if handled, it may discharge a pungent smelling exudate from the cloaca as a warning. It is a fairly docile subspecies and will rarely bite. It is one of the most commonly bred milk snakes in captivity.

Lampropeltis triangulum sinaloae, commonly known as the Sinaloan milk snake, is an egg-laying subspecies of nonvenomous colubrid snake.
