There are a couple of dozen subspecies of the Milk Snake
(Lampropeltis triangulum), which themselves are species of King Snake (so called since they eat other snake species).
The Sinaloan is native to northwestern Mexico.
The name Milk Snake derives from a myth that they suck milk from cows at night since they
are active at night around barns - but in fact they prey on mice and rats there.
They can reach nearly 3 feet long (1 metre).
Pueblan Milk Snake
Lampropeltis triangulum campbelli
The Pueblan, also called Campbell's Milk Snake, is native to southern Mexico. Milk Snakes are not venomous and are
harmless to humans but several of them look similar to the highly venomous Coral Snakes that also tend to have red and
black banding (often with yellow warning colour rather than white). This is known as Batesian mimicry and the confusion
is intended in nature to protect them from predators. However, in the human world, it has the opposite effect,
since many are killed in the mistaken belief they are venomous.