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The pygmy three-toed sloth is unique in that it is found exclusively in the red mangroves of Isla Escudo de Veraguas; the island has a small area of approximately 4.3 square kilometres (1.7 sq mi). A 2012 census of pygmy three-toed sloths estimated the total population at 79 – of which 70 occurred on mangroves and 9 in the surroundings.
They range in size from the silky anteater, at 36 cm (14 in) plus a 18 cm (7 in) tail, to the giant anteater, at 120 cm (47 in) plus a 90 cm (35 in) tail. No pilosans have population estimates, but the pygmy three-toed sloth is categorized as critically endangered .
Three-toed sloths are about the size of a small dog or a large cat, with the head and body having a combined length of around 45 cm (18 in) and a weight of 3.5–4.5 kg (8–10 lb). Unlike the two-toed sloths, they also have short tails of 6–7 cm (2–3 in), and they have three clawed toes on each limb.
The pale- and brown-throated three-toed sloths mate seasonally, while the maned three-toed sloth breeds at any time of the year. The reproduction of pygmy three-toed sloths is currently unknown. Litters are of one newborn only, after six months' gestation for three-toed, and 12 months for two-toed. Newborns stay with their mother for about five ...
Extant two-toed sloths are more closely related to some extinct ground sloths than to three-toed sloths. Suborder: Folivora. Family: Bradypodidae (three-toed sloths) Genus: Bradypus. Pygmy three-toed sloth, Bradypus pygmaeus CR; Brown-throated sloth, Bradypus variegatus LC; Family: Choloepodidae (two-toed sloths) Genus: Choloepus
Family Bradypodidae: three-toed sloths Pygmy three-toed sloth, Bradypus pygmaeus; Brown-throated three-toed sloth, Bradypus variegatus; Pale-throated three-toed sloth, Bradypus tridactylus; Maned three-toed sloth, Bradypus torquatus; Family †Megalonychidae: megalonychid ground sloths; Family †Megatheriidae: megatheriid ground sloths
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The brown-throated sloth is of similar size and build to most other species of three-toed sloths, with both males and females being 42 to 80 cm (17 to 31 in) in total body length. The tail is relatively short, only 2.5 to 9 cm (1.0 to 3.5 in) long.