Nilsson was a prolific author, publishing large works on different groups of the fauna of Scandinavia. He worked as a field archaeologist and introduced ethnographic perspectives in archaeology. He was made a member of the Royal Swedish Academy of Sciences in 1821.[1]
Nilsson corresponded with William Yarrell, acting as the authority on Swedish avifauna for Yarrell's History of British Birds (1843). For example, Yarrell records Nilsson as saying "it infests every house", referring to the house sparrow.[2]
^Beolens, Bo; Watkins, Michael; Grayson, Michael (2011). The Eponym Dictionary of Reptiles. Baltimore: Johns Hopkins University Press. xiii + 296 pp. ISBN978-1-4214-0135-5. ("Nilsson", p. 191).