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The red sand boa, scientifically known as Eryx johnii, is a non-venomous snake species belonging to the family Boidae. It is also commonly referred to as the Indian sand boa or two-headed snake due to its unique appearance. Here is a description of the red sand boa:

Size and Appearance:
- The red sand boa is a small to medium-sized snake with a stout body and a short, tapering tail.
- On average, it measures between 2 to 3 feet in length, although larger specimens can reach up to 4 feet.
- The body of the red sand boa is cylindrical and muscular, giving it a robust appearance.
- It has smooth scales that are typically reddish-brown in color, although the shade may vary from light pinkish-brown to dark reddish-brown.
- Some individuals may have darker markings or patterns, such as spots or stripes, along their body, while others may appear more uniform in coloration.
- The head of the red sand boa is relatively small and rounded, with small eyes and a blunt snout.

Habitat and Distribution:
- The red sand boa is primarily found in the Indian subcontinent, including countries like India, Pakistan, Sri Lanka, and Bangladesh.
- It inhabits a range of habitats, including arid and semi-arid regions, sandy areas, rocky hillsides, scrublands, and grasslands.
- The snake is adapted to burrowing and can often be found underground or hidden beneath loose soil or rocks.

Behavior and Diet:
- Red sand boas are primarily nocturnal and secretive, spending much of their time burrowed in the ground or hiding under cover.
- They are solitary snakes and are known for their sedentary lifestyle.
- These snakes are constrictors, meaning they capture and subdue their prey by coiling their bodies around them to restrict their breathing.
- The diet of red sand boas mainly consists of small mammals, such as mice, rats, shrews, and occasionally lizards.
- They are ambush predators, patiently waiting for their prey to pass by before striking.

Reproduction:
- Red sand boas are ovoviviparous, which means they give birth to live young ones instead of laying eggs.
- The female snake retains the eggs internally and gives birth to fully formed young, typically ranging from 3 to 14 in number.
- The newborns are relatively large compared to the size of the adults, measuring around 10 to 12 inches in length.

Conservation Status:
- The red sand boa is not currently listed as a threatened species. However, it faces certain threats such as habitat loss, illegal wildlife trade, and persecution due to superstitions associated with the snake.

Overall, the red sand boa is an intriguing and unique snake species known for its striking reddish-brown coloration and burrowing lifestyle.