Manatee in the context of "Cervical vertebrae"

The dugong (/ˈd(j)uːɡɒŋ/; Dugong dugon) is a marine mammal. It is one of four living species of the order Sirenia, which also includes three species of manatees. It is the only living representative of the once-diverse family Dugongidae; its closest modern relative, Steller's sea cow (Hydrodamalis gigas), was hunted to extinction in the 18th century.

The dugong is the only sirenian in its range, which spans the waters of some 40 countries and territories throughout the Indo-West Pacific. The dugong is largely dependent on seagrass communities for subsistence and is thus restricted to the coastal habitats that support seagrass meadows, with the largest dugong concentrations typically occurring in wide, shallow, protected areas, such as bays, mangrove channels, the waters of large inshore islands, and inter-reefal waters. The northern waters of Australia between Shark Bay and Moreton Bay are believed to be the dugong's contemporary stronghold.

Deciduous teeth or primary teeth, also informally known as baby teeth, milk teeth, or temporary teeth, are the first set of teeth in the growth and development of humans and other diphyodonts, which include most mammals but not elephants, kangaroos, or manatees, which are polyphyodonts. Deciduous teeth develop during the embryonic stage of development and erupt (break through the gums and become visible in the mouth) during infancy. They are usually lost and replaced by permanent teeth, but in the absence of their permanent replacements, they can remain functional for many years into adulthood.

The Sirenia (/saɪˈriːniə/ sy-REE-nee-ə), commonly referred to as sea cows or sirenians, are an order of fully aquatic, herbivorous mammals that inhabit swamps, rivers, estuaries, marine wetlands, and coastal marine waters. The extant Sirenia comprise two distinct families: Dugongidae (the dugong and the now extinct Steller's sea cow) and Trichechidae (manatees, namely the Amazonian manatee, West Indian manatee, and West African manatee) with a total of four species. The Protosirenidae (Eocene sirenians) and Prorastomidae (terrestrial sirenians) families are extinct. Sirenians are classified in the clade Paenungulata, alongside the elephants and the hyraxes, and evolved in the Eocene 50 million years ago (mya). The Dugongidae diverged from the Trichechidae in the late Eocene or early Oligocene (30–35 mya).

Sirenians grow to between 2.5 and 4 metres (8.2 and 13.1 feet) in length and 1,500 kilograms (3,300 pounds) in weight. The recently extinct Steller's sea cow was the largest known sirenian to have lived, reaching lengths of 10 metres (33 feet) and weights of 5 to 10 tonnes (5.5 to 11.0 short tons).

The Amazonian manatee (Trichechus inunguis), commonly referred to as cowfish in Brazil, is a species of manatee that lives in the Amazon Basin in Brazil, Peru, Colombia and Ecuador. It has thin, wrinkled brownish or gray colored skin, with fine hairs scattered over its body and a white chest patch. It is the smallest of the three extant species of manatee.

Opération Lamantin (French for manatee) was a December 1977 – July 1978 military intervention by France on the behalf of the Mauritanian government, in its war against Sahrawi guerrilla fighters of the Polisario Front, seeking independence for Western Sahara. Airstrikes were launched in the provinces with the aim of stopping separatist raids in the rail route from the iron mines in Zouérat to the coast of Nouadhibou (the Mauritania Railway), and pushing them to release French hostages. France used Jaguar combat aircraft from Dakar Airbase. The bombings targeted areas around the railway, which was constantly raided by Polisario. The mission ended with the release of the hostages and the halt of Polisario's attacks on ore cargo.

However, the disastrous performance in the war was a major reason for the Mauritanian armed forces to overthrow Moktar Ould Daddah, the President of Mauritania in July 1978 and an immediate cease-fire with the Polisario. Mauritania subsequently pulled out of Western Sahara in 1979 and mended relations with their Sahrawi neighbours and went on to recognize them in 1984.