The young male W8-Felix, a pup of Hilda's, was captured and collared on 25 August 2004 near Pogoreli Vrh in Gorski Kotar. He weighed 14.5 kg and was just getting his adult teeth. Considering that Hilda had left the Risnjak pack in spring 2003 and become the reproductive female of the Snježnik pack, both wolves were members of the Snježnik pack. Felix was discovered to be the grandson of the reproductive wolf (alpha-female) of the Risnjak pack, W10-Tanja, who was later and collared and monitored. Felix died of disease.