Phrumsengla is home to several species of threatened birds, namely the rufous-necked hornbill (Aceros nipalensis), the rufous-throated wren-babbler (Spelaeornis caudatus), the satyr tragopan (Tragopan satyra), the beautiful nuthatch (Sitta formosa), Ward's trogon (Harpactes wardi) and the chestnut-breasted partridge (Arborophila mandellii), as well as a near-threatened species, the wedge-billed wren babbler (Sphenocichla humei).

Mammals in the area include various species native to South Asia and the Indian Subcontinent.

There are large and small herbivorous ungulates, such as the Asian elephant (Elephas maximus),[3] Indian rhinoceros (Rhinoceros unicornis) and the wild water buffalo (Bubalus arnee), as well as swamp deer, or barasingha (Rucervus duvaucelli), Himalayan goral (Naemorhedus goral), hog deer (Axis porcinus), mainland serow (Capricornis sumatraensis), and the northern red muntjac (Muntiacus vaginalis).

[5] Several primates[5] and carnivores, including the elusive snow leopard (Panthera uncia) which roams the high, inaccessible peaks, are found here as well, such as Assamese and rhesus macaques and capped and Gee's golden langurs, dholes, Eurasian and smooth-coated otters, mainland leopard cats, and the yellow-throated marten.

Nearly 11,000 people live within the Phrumsengla area demonstrating, in the Trust Fund's opinion, the kingdom's "closest success to a harmonious balance between man and nature.