Dugong

Overview

The dugong (Dugong dugon) is a large, herbivorous marine mammal and the only surviving member of the family Dugongidae. Often referred to as a "sea cow," it is closely related to manatees but can be distinguished by its whale-like, fluked tail and downward-angled muzzle. These mammals are primarily found in shallow, protected coastal waters across the Indo-Pacific region, where they rely on seagrass meadows for their survival.

Distribution & habitat

Dugongs inhabit tropical and subtropical coastal waters spanning from East Africa to Vanuatu. They prefer sheltered environments such as wide, shallow bays, mangrove channels, and areas protected by inshore islands. While they are not considered migratory, they may travel significant distances to locate suitable seagrass beds. The largest remaining populations are found in the waters of northern Australia and the Arabian Gulf.

Appearance

This species has a bulbous, grey-brown body with paddle-like flippers and no dorsal fin. Their head is distinctively shaped, featuring a broad, downward-facing muzzle adapted for grazing on the seabed. They possess small eyes and ears, and males often develop tusk-like upper incisors. Their bones are notably dense, which is thought to help them remain submerged while feeding.

Feeding

Dugongs are the only fully herbivorous marine mammals, feeding almost exclusively on seagrass. They use their muscular, broad muzzles to crop both the leaves and roots of seagrass, often leaving behind visible feeding trails on the seafloor. A mature individual can consume large quantities of seagrass daily to meet its nutritional needs.

Biology & behavior

Dugongs are long-lived animals, with some individuals reaching over 70 years of age. They are slow-growing and have a low reproductive rate, with females typically producing their first calf between 6 and 18 years of age. Due to their long gestation periods and extended parental care, populations are highly vulnerable to environmental changes and human-related threats, including habitat loss, boat strikes, and pollution.