Yourka is a sanctuary for a wide range of species, including a population of Mareeba 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 Hill in the south. Yourka also protects these significant species and communities:
Animals
Red Goshawk (nationally vulnerable),
Masked Owl (northern) (nationally vulnerable), Square-tailed Kite,
Greater Glider,
Long-nosed Bandicoot, Brush-tailed Possum at least 3 species of Night Jar and a variety of Quail and Button Quail species.
Plants
Trigger plants, Dodonaea uncinata (a rare hopbush), Range bloodwood, Boronia occidentalis (a rare boronia), Green truffle orchid
Vegetation communities
Moist eucalypt woodland, Heathy woodland, Gum-topped box woodland, Tall riparian forests, Bloodwood–ironbark woodland, Poplar gum woodland.