A post mortem examination on a Pere David's deer reared on a deer farm in Kosewo (Mazurian Lakeland) revealed the presence of 215 specimens of Spiculopteragia suppereri in the abomasum. In spite of the fact that the world population of this particular deer species dwindled at one point in the last century to just a few individuals in China, a nematode species typical to it remained in existence.