Along the foot of a tilted, red rock a porcupine came nosing and grubbing. It broke open a tiny shelter of sticks and some meagre, round-eared little creature, all eyes and bony limbs, fled across the stones.
I can't understand a grammatical role of all eyes and bony limbs. It seems to be a description of those little creatures, but I feel that in this case there should be a participle or a verb: something like round-eared little creature, all are eyes and bony limbs emphasising that these body parts seem to be only ones they consist of (I think it is what the author meant); or some preposition tying the description to little creatures: little creatures with eyes and bony limbs ....