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Chevrotain

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Chevrotains are small, even-toed ungulates belonging to the family Tragulidae. They are the only living members of the infraorder Tragulina. While they are often called "mouse-deer," they are not closely related to true deer. This distinction is why the name is often hyphenated. These animals are significant because they are the smallest hoofed mammals on Earth.

Most species live in the forests of South and Southeast Asia. However, one specific species, the water chevrotain, lives in the rainforests of Central and West Africa.

Javan Chevrotain (Harvard University)
Javan Chevrotain (Harvard University)

The biology of the chevrotain shows a mix of modern and primitive traits. They are considered an archaic ruminant type. Like other ruminants, they have a four-chambered stomach to ferment tough plant material. However, their third stomach chamber is poorly developed. They also lack upper incisors, which are the front teeth used for biting. Instead, both sexes possess elongated canine teeth. In males, these teeth project from the sides of the lower jaw and are used in fights.

Their physical structure is specialized for life in dense environments. Chevrotains have short, thin legs. This build helps them maintain a small profile while running through thick foliage. They also possess several features similar to pigs. These include having four toes on each foot and lacking facial scent glands. Some species also have premolars with sharp crowns. Unlike many other even-toed ungulates, they lack a carotid rete. This is a system that allows animals to exchange heat to cool blood entering the brain. Without it, they cannot easily exploit hot, arid habitats.

Moschiola indica in Singapore Zoo
Moschiola indica in Singapore Zoo

There are currently 10 extant species divided into three different genera. The genus *Tragulus* includes species like the Java mouse-deer and the Philippine mouse-deer. The genus *Moschiola* contains the Indian spotted chevrotain and the Sri Lankan spotted chevrotain. The genus *Hyemoschus* contains only the water chevrotain. Scientists often use different names based on physical markings. Species with pale spots or stripes are called "chevrotains." Those without these markings are called "mouse-deer."

Size and weight vary significantly between the Asian and African species. Asian species typically weigh between 1.5 and 4 kilograms. The water chevrotain is much larger, weighing between 7 and 12 kilograms. The Java mouse-deer holds a record for being the smallest surviving artiodactyl. It has an average length of 44 centimeters and an average height of 25 centimeters. These small dimensions allow them to navigate complex forest floors.

Javan Chevrotain (Harvard University)
Javan Chevrotain (Harvard University)

The history of the Tragulidae family spans millions of years. They were widespread and successful from the Oligocene, about 34 million years ago, through the Miocene, about 5 million years ago. Many other genera, such as *Dorcatherium* and *Siamotragulus*, are now extinct. While the family has changed little over time, modern conservation is still active. In November 2019, scientists announced they had photographed silver-backed chevrotains in Vietnam. This was the first confirmed sighting of the species since 1990.

Dorcatherium
Dorcatherium

Chevrotains have interesting connections to both nature and culture. Some species show a strong affinity for water. They can stay submerged for long periods to hide from predators. This behavior has led some to suggest that whales might have evolved from water-loving ancestors that resembled small deer.

Bowhead-Whale1 (16273933365)
Bowhead-Whale1 (16273933365)

In Malay folklore, the mouse-deer is a famous trickster. Legend says a mouse-deer once kicked a hunting dog into a river. This event inspired King Parameswara to found the Malacca Sultanate. Today, the coat of arms of Malacca features two mouse-deer to honor this legend.

Coat of arms of Malacca
Coat of arms of Malacca
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🖼️ Images & Media (11)
File:Rare mating photograph of 'Mouse Deers' at Singapore Zoo(23-10-07).JPG
Rare mating photograph of 'Mouse Deers'...
File:Cladogram of Cetacea within Artiodactyla (Camelus bactrianus).png
Cladogram of Cetacea within Artiodactyla...
File:Recherches pour servir à l'histoire naturelle des mammifères (Pl. 80) (white background).jpg
Recherches pour servir à l'histoire...
File:Tragulus napu - 1818-1842 - Print - Iconographia Zoologica - Special Collections University of Amsterdam - (white background).jpg
Tragulus napu - 1818-1842 - Print -...
File:Walia ibex illustration white background.png
Walia ibex illustration white background.png
File:Voyage en Abyssinie Plate 2 (white background).jpg
Voyage en Abyssinie Plate 2 (white background).jpg
File:Bowhead-Whale1 (16273933365).jpg
Bowhead-Whale1 (16273933365).jpg
File:Moschiola indica in Singapore Zoo.jpg
Moschiola indica in Singapore Zoo.jpg
File:Javan Chevrotain (Harvard University).JPG
Javan Chevrotain (Harvard University).JPG
File:Dorcatherium.jpg
Dorcatherium.jpg
File:Coat of arms of Malacca.svg
Coat of arms of Malacca.svg
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