Yourka is a sanctuary for a wide range of species, including a population of Rock-wallabies. There are localised areas of granite outcrop with steep faces and occasional overhangs which they use as a refuge. The main one is Tiger mountain in the south-east. Yourka also protects these significant species and communities:
Red Goshawk (nationally vulnerable), Masked Owl (northern) (nationally vulnerable), Square-tailed Kite, Brolga, Greater Glider, Long-nosed Bandicoot
, Brush-tailed Possum
Trigger plants, Dodonaea uncinata (a rare hopbush), Range bloodwood, Boronia occidentalis (a rare boronia), Green truffle orchid
Moist eucalypt woodland, Heathy woodland, Gum-topped box woodland, Tall riparian forests, Bloodwood–ironbark woodland, Poplar gum woodland.