 The pygmy three @-@ toed sloth is unique in that it is found exclusively in the red mangroves of Isla Escudos de Veraguas ; it is confined to 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 . The population density was calculated as 5 @.@ 8 per hectare . The total area occupied by mangroves on the island was estimated to be around 10 @.@ 67 hectares ( 0 @.@ 0412 sq mi ) . While their population has presumably always been low due to their restricted range , the 2012 census found far lower numbers than had been estimated ( less than 500 ) by the IUCN in 2010 . 
