Anderson's gerbil (Gerbillus andersoni) is a species of rodent distributed from Tunisia to Israel. Their habitats and diets are similar to other gerbils. The gestation period is 20–22 days and the average litter size is four or five. The IUCN formerly listed the junior synonym Gerbillus allenbyi as vulnerable. Physical description Anderson's gerbil is a medium-sized rodent with a tail that is long compared to the rest of its body. This rodent has dense fur with a tan color along with some reddish tint on the upper part of the body with a white underbelly. The ears of the gerbil are very large with a dark fur color. The ears of this animal is distinctive in that it does not have the white patch behind the ear as others of the genus Gerbillus. Typical of the species in Gerbillus, Anderson's gerbil has large eyes with a black ring around them. There is a distinct white patch that appears above each of the eyes. The gerbil has long hind limbs while the front limbs are shorter. The length Anderson's gerbil is estimated between 19 and 27 cm. The tail length can vary from 11 to 15 cm. The mammal can weigh from 15.9 to 38.4 grams. Habitat and distribution Anderson's gerbil usually occupies sandy dunes of deserts and is primarily found in sandy, often solidified, dunes along the coastal regions of its distribution range. This animal can also be found inland and tends to live in sandy areas of valleys or very dry areas, along with mountainsides. Anderson's gerbil inhabits coastal plains of North Africa and the Middle East, from Tunisia and northern Libya to Egypt, Israel, and southwestern Jordan. Biology and reproduction Like all other species in the genus Gerbillus, Anderson's gerbil is a burrowing rodent. The evidence for this mammal tends to suggest that it has a nomadic lifestyle considering that the warrens that it builds are not as complex as other genera of gerbils. However, the species sometimes live in groups when they are in a favorable habitat. They occupy a small home range of typically from 32 to 34 square meters, and are nocturnal. They are seed-eating gerbils and feed on the seeds of the common evergreen Thymelaea hirsuta. The breeding season occurs during late winter and early spring, coinciding with the seed shedding of Thymelaea hirsuta. Both genders of the species are active for reproductive purposes