Today they have been eliminated from majority of their erstwhile range, especially in Thailand; populations are declining in most of the range countries. The hair is silky and fine, and is the shortest of all bear species, suiting their hot tropical habitat.  Population densities vary from 4.3 and 5.9 individuals per 100 km2 (39 sq mi) in Khao Yai National Park (Thailand) to 26 individuals per 100 km2 (39 sq mi) in the Harapan Rainforest in southern Sumatra. Two subspecies have been proposed on the basis of variations in size:  Genetic differences between the two subspecies are obscure.  Compared to other continents, southeastern Asia has undergone severe depletion in forest cover over the past few decades (by almost 12% between 1990 and 2010); this has resulted in substantial habitat loss for forest-dependent species such as sun bears.  In 1825, American naturalist Thomas Horsfield placed the species in a genus of its own, Helarctos.  Sun bears are noted for their intelligence; a captive bear observed sugar being stored in a cupboard then locked by a key, and later used its own claw to open the lock. The Malayan Sun Bears weight can range from 60 to 145 pounds, with males being slightly larger. The sun bear is named so for its characteristic orange to cream coloured, crescent-like chest patch. , Sun bears are shy and reclusive animals, and usually do not attack humans unless provoked to do so, or if they are injured or with their cubs; their timid nature led these bears to be tamed often and kept as pets in the past.
2020 helarctos malayanus euryspilus