TREE SHREWS – Scandentia

TREE SHREWS

TREE SHREW FACTS

In physical appearance, tree shrews resemble a squirrel with a long snout, nose. The scientific family name is from the Malay word tupai, which means squirrel. Animals in this family are commonly referred to as tree shrews, ever since they were first mistaken for shrews when they were first spotted in 1780.

Shrews are small, insect eating mammals with pointy snouts.

Tree shrews are relatively small, with the head and body length ranging from about 5 to 9.5 inches (13 to 24 centimeters). These animals have a long tail, which is covered with long thick hair in all the species except the pen-tailed tree shrew. The tails of pen-tailed tree shrews are hairless except for a whitish feathershaped arrangement of hairs near the end. In general, tree shrews have small ears similar to those of a squirrel, and their ears are covered with fur. An exception is the ears of the pen-tailed tree shrews, which are bare and larger than all the other species.

Fur colors of tree shrews range from gray to dark brown on the upper side of their body, and white, yellow-brown, or dark brown on their belly. Their fur is generally soft and thick. Some species have light shoulder stripes and others have facial markings. Their legs are short, with claws on their fingers and toes.

WHERE DO SHREWS LIVE

Tree shrews are found in south and Southeast Asia, ranging from India and southwest China eastward through Malaysia, Indonesia, and the Philippines. Out of the nineteen tree shrew species, ten live on the island of Borneo.

SHREW HABITAT

Tree shrews live in shrub and forested areas, which are often mountainous. Many of the tree shrews are arboreal, meaning that they live in trees. Some species spend the majority of their time on the ground.

WHAT DO SHREWS EAT

Tree shrews primarily eat a combination of insects and fruits. They also will occasionally feed on plant material, along with other small animals, including fish and mice. Different tree shrew species have their own feeding method, one species may collect black ants at night while another species digs up earthworms.

BEHAVIOR AND REPRODUCTION

In general, tree shrews are active during the day. The pentailed tree shrew is nocturnal, meaning that it is active at night. Researchers do not know a lot about the behavior of tree shrews. One reason is that they are difficult to observe because they are highly active animals that move quickly and constantly. All tree shrews have the ability to climb trees. They use their sharp claws to dig into the trees and branches as they climb. Many species are arboreal, while others find their food and spend a great deal of time on the ground. Tree shrews commonly use the same paths along the ground or on branches to reach their favorite feeding or resting areas.

They have well-developed senses of vision, hearing, and smell. These animals typically catch food with their snout, and use their hands only when they cannot reach their food. They may grab hold of flying insects with their hands. They eat in a style similar to squirrels, hunching on their hind legs while holding the food in their arms and eating it.

Most species nest in holes in tree trunks or branches. These animals make a nest of dried leaves, twigs, and soft wood. Tree shrews are territorial, meaning they protect their own territory. They release droplets of urine and scent to mark their territory. Tree shrews have specialized glands, located on their chest and belly, which produce the chemical scent. Many of the scents are distinct to a particular animal. They deposit their scent in areas where other animals may smell it to let them know that the area is occupied. Tree shrews live in monogamous (muh-NAH-guh-mus) pairs, meaning they have one mate. Gestation, or pregnancy, lasts between forty-three and fifty-six days.

Females give birth to small litters (young born at the same time) of poorly developed, hairless offspring. The typical litter size ranges from one to three offspring. Baby tree shrews are often born in pairs. In many of the species studied, researchers found an unusual mothering strategy unlike other mammals. Mother tree shrews visit their babies only once every two days for about two minutes each visit. When the mother visits her young in the nest, she immediately allows the babies to nurse, which they do quickly. Babies take in large amounts of milk and lie back with a bloated stomach. With no mother in the nest, the babies snuggle with each other to keep warm. The babies also groom each other, a task traditionally done by the mother. Field studies have found that tree shrews breed when fruiting peaks occur in the forest.

TREE SHREWS AND PEOPLE

With their close relationship to primates, and a welldeveloped sense of vision and hearing, tree shrews are being used by researchers as animal models for human diseases. An animal model is an animal studied that mimics human biological or psychological disease. Research studies have included hepatitis (hep-uh-TIE-tuhs), a disease of the liver, vision disorders, and psychosocial stress.

CONSERVATION STATUS

The majority of tree shrew species are common, however several are Endangered or Threatened. Long-footed tree shrews and Nicobar tree shrews are Endangered, facing a very high risk of extinction in the wild. Bornean smooth-tailed tree shrews, golden-bellied tree shrews, Palawan tree shrews, and Mindanao tree shrews are Vulnerable, facing a high risk of extinction in the wild. Mindanao tree shrews are listed as Near Threatened, not currently threatened, but could become so.