Among other things, he reported on the wild population of Bactrian camels as well as the Przewalski's horse and Przewalski's gazelle, named after him.
Raziskal je več kot 18.000 km2, zbral in prinesel s seboj 5000 rastlin, 1000 ptic in 3000 vrst žuželk, kot tudi 70 plazilcev in kože 130 različnih sesalcev.