 Plant species used by black @-@ tailed jackrabbits are well documented for desert regions . <unk> use in other regions is less well known . However , black @-@ tailed jackrabbits <unk> Douglas fir ( <unk> <unk> ) , ponderosa pine ( Pinus ponderosa ) , lodgepole pine ( P. <unk> ) , and western hemlock ( <unk> <unk> ) seedlings , and oak ( Quercus spp . ) seedlings and <unk> . 
