1.  rock wren(n = noun.animal) xenicus gilviventris - short-tailed bird resembling a wren;
is a kind of new zealand wren
is a member of genus xenicus, xenicus

2.  rock wren(n = noun.animal) salpinctes obsoletus - wren inhabiting badlands and mesa country of western United States and Mexico;
is a kind of jenny wren, wren
is a member of genus salpinctes, salpinctes

acid rock, american rock brake, arenaceous rock, argillaceous rock, art rock, bed rock, black rock desert, cactus wren, carolina wren, clastic rock, cock of the rock, crushed rock, emery rock, emu wren, hard rock, house wren, igneous rock, jenny wren, john rock, little rock, living rock, long-billed marsh wren, marsh wren, metamorphic rock, new zealand wren, pay rock, plutonic rock, plymouth rock, porphyritic rock, progressive rock, psychedelic rock, punk rock, purple rock brake, rock, rock 'n' roll, rock 'n' roll musician, rock and roll, rock band, rock barnacle, rock bass, rock beauty, rock bit, rock bottom, rock brake, rock cake, rock candy, rock climber, rock climbing, rock concert, rock cornish, rock cornish hen, rock crab, rock cress, rock crystal, rock dove, rock drill, rock elm, rock fever, rock garden, rock geranium, rock group, rock gunnel, rock harlequin, rock hind, rock hopper, rock hyrax, rock island, rock kangaroo, rock lobster, rock maple, rock music, rock of gibraltar, rock oil, rock opera, rock outcrop, rock partridge, rock penstemon, rock pigeon, rock pink, rock plant, rock polypody, rock purslane, rock python, rock rabbit, rock rattlesnake, rock rose, rock salmon, rock salt, rock sandwort, rock sea bass, rock shaft, rock snake, rock spikemoss, rock springs, rock squirrel, rock staff, rock star, rock sunfish, rock wallaby, rock wool, ruby-crowned wren, rudaceous rock, sedge wren, sedimentary rock, short-billed marsh wren, sir christopher wren, volcanic rock, wall rock, winter wren, wren, wren warbler