Hodgson studied all aspects of natural history around him including material from Nepal, Sikkim and Bengal. He amassed a large collection of birds and mammal skins which he later donated to the British Museum. He described a species of antelope which was named after him, the Tibetan Antelope "Pantholops hodgsonii". He also described the pygmy hog which he gave the scientific name of "Porcula salvania", the species name derived from the Sal forest ("van" in Sanskrit) habitat where it was found. He also discovered 39 species of mammals and 124 species of birds which had not been described previously, 79 of the bird species were described himself. The zoological collections presented to the British Museum by Hodgson in 1843 and 1858 contained 10,499 specimens. In addition to these, the collection also included an enormous number of drawings and coloured sketches of Indian animals by three native artists under his supervision. These sketches include anatomical details and Hodgson may have learned dissection and anatomy from Archibald Campbell. One of them was Raj Man Singh, but many of the paintings are unsigned. Most of them were subsequently transferred to the Zoological Society of London and the Natural History Museum.