Eastern Hognose Snake

## Description

The eastern hog-nosed snake (Heterodon platyrhinos ), also known as the spreading adder and many other common names, is a species of mildly venomous rear-fanged snake in the family Colubridae. The species is endemic to North America. There are no subspecies that are recognized as being valid.

## Appearance

The Eastern hognose snake is a thick-bodied snake native to North America. These snakes are mildly venomous and not harmful to humans. Their teeth inject a mild amphibian-specific venom into prey, and also are used to "pop" inflated toads like a balloon to enable swallowing. Eastern hognose snakes have a slightly upturned snout, which gives this species its name. They use it for digging in sandy soils. The color pattern of these snakes is extremely variable. It can be red, green, orange, brown, gray to black, or any combination thereof depending on locality. They can be blotched, checkered, or patternless. The belly tends to be a solid gray, yellow, or cream-colored. Females in this species are larger than males.

## Distribution

Eastern hognose snakes are found from eastern-central Minnesota, and Wisconsin to southern Ontario, Canada, and extreme southern New Hampshire, south to southern Florida, and west to eastern Texas and western Kansas. They live in forests and woodlands, fields, shrubland, prairies, grassland, river valleys, and coastal areas. These snakes prefer to live in habitats with sandy soils, into which they burrow.

## Behavior

Eastern hognose snakes are diurnal and solitary animals. They are mostly active during the summer months and usually begin hibernation in September-November. They hibernate individually underground in burrows that they excavate in sandy soil. However, they may also shelter in abandoned burrows of other animals. When threatened, Eastern hognose snakes will flatten their neck and raise their head off the ground. They also hiss and will strike, but they do not attempt to bite. If this threat display does not work to deter a would-be predator, a hognose snake will often roll onto its back and play dead, going so far as to emit a foul musk from its cloaca and let its tongue hang out of its mouth.

## Venom

Although H. platirhinos is rear-fanged, it is often considered nonvenomous because it is not harmful to humans. Heterodon means "different tooth", which refers to the enlarged teeth at the rear of the upper jaw. These teeth inject a mild amphibian-specific venom into prey. The fangs receive the venom from the snake's Duvernoy's gland. Bitten humans who are allergic to the saliva have been known to experience local swelling, but no human deaths have been documented.

## Diet

Eastern hognose snakes are carnivores and feed extensively on amphibians. They have a particular fondness for toads but will also consume frogs, salamanders, small mammals, birds, and invertebrates.

## Reproduction

Eastern hognose snakes are polygynandrous (promiscuous) meaning that both males and females have multiple partners. They mate in April and May. The females lay 8-40 eggs (average about 25) in June or early July in burrows in sandy soil, which they excavate or may also deposit eggs in rotting logs or under rocks or leaves. The incubation period lasts around 60 days. Hatchlings are independent at birth and don't need parental care. Young females usually become reproductively mature at 21 months of age while males reach maturity when they are 18-24 months old.

## Population

### Population threats

There are no major threats to Eastern hognose snakes. However, locally these snakes do suffer from habitat loss and fragmentation, road mortality, environmental degradation, and intentional killing.

### Population number

According to IUCN, the Eastern hognose snake is locally common and widespread throughout its range but no overall population estimate is available. Currently, this species is classified as Least Concern (LC) on the IUCN Red List and its numbers today are stable.

## Fun Facts

Other common names of this species include hog-nosed snake, adder, bastard rattlesnake, black adder, black blowing viper, black hog-nosed snake, black viper snake, blauser, blower, blowing adder, blowing snake, blow(ing) viper, blow snake, buckwheat-nose snake, calico snake, checkered adder, checquered adder, chunk head, common hog-nosed snake, common spreading adder, eastern hognose snake, flat-head, flat-head(ed) adder, hay-nose snake, hissing adder, hissing snake, hog-nosed adder, hog-nosed rattler, hog-nose snake, hog-nosed viper, hissing viper, (mountain) moccasin, North American adder, North American hog-nosed snake, pilot, poison viper, puff(ing) adder, red snake, rock adder, rossel bastard, sand adder, sand viper, spotted (spreading) adder, spread nelly, spread-head moccasin, spread-head snake, spread-head viper, flat-head adder (spreading) viper.

## References

https://animalia.bio/eastern-hognose-snake