Sylvatic
Sylvatic is a scientific term referring to wild animals, often in context of diseases or pathogens that only affect them. In the context of animal research, its opposite is domestic, which refers to pets, farm animals or other animals which do not dwell in the wild.
The word "sylvatic" is also simply a synonym for "sylvan" = "of the forest".
The Latin words silvatica, silvaticus of this root are commonly used in biological taxonomy: Rana sylvatica, agaricus silvaticus, etc.