species (including Peromyscus californicus, Peromyscus maniculatus, Peromyscus melanophrys, Peromyscus eremicus, and Peromyscus aztecus). A variety of mutations affecting their behavior, biochemistry, and the color of their coats is exhibited in these genetic lines. Species Peromyscus californicus group California deermouse – P. californicus eremicus group Cactus mouse – P. eremicus Burt's deer mouse– P. caniceps Dickey's deer mouse – P. dickeyi Eva's desert mouse – P. eva Northern Baja deer mouse– P. fraterculus Angel Island mouse – P. guardia – possibly extinct P. g. guardia – last seen 1991 P. g. mejiae – extinct (1973) P. g. harbisoni – extinct (1963) P. guardia subsp. indet. from Estanque Island – extinct (1998) San Lorenzo mouse – P. interparietalis Mesquite mouse – P. merriami Pemberton's deer mouse – P. pembertoni – extinct (1931) False canyon mouse – P. pseudocrinitus hooperi group Hooper's mouse – P. hooperi crinitus group Canyon mouse – P. crinitus maniculatus group Eastern deer mouse − P. maniculatus Yukon deer mouse – P. arcticus Gambel's deer mouse – P. gambelii Northwestern deer mouse – P. keeni Southern deer mouse – P. labecula Black-eared mouse – P. melanotis †Giant island deer mouse – P. nesodytes – extinct Oldfield mouse or beach mouse – P. polionotus P. p. allophrys P. p. ammobates Pallid beach mouse P. p. decoloratus – extinct (1959) P. p. leucocephalus P. p. niveiventris P. p. peninsularis Anastasia Island beach mouse P. p. phasma P. p. trissyllepsis Santa Cruz mouse – P. sejugis Slevin's mouse – P. slevini Western deer mouse – P. sonoriensis leucopus group White-footed mouse– P. leucopus Cotton mouse– P. gossypinus Key Largo cotton mouse P. g. allapaticola †Chadwick Beach cotton mouse P. g. restrictus – extinct (1938) aztecus group Aztec mouse – P. aztecus Transvolcanic deer mouse – P. hylocetes Oaxacan deer mouse – P. oaxacensis Gleaning mouse – P. spicilegus Winkelmann's mouse – P. winkelmanni boylii group Brush mouse – P. boylii Orizaba deer mouse – P. beatae Carleton's deer mouse – P. carletoni Kilpatrick's deer mouse – P. kilpatricki Nimble-footed mouse – P. levipes Tres Marías Island mouse – P. madrensis Chihuahuan mouse – P. polius La Palma deer mouse – P. sagax Schmidly's deer mouse – P. schmidlyi Nayarit mouse – P. simulus San Esteban Island mouse – P. stephani truei group Pinyon mouse – P. truei Texas mouse – P. attwateri Perote mouse - P. bullatus Zacatecan deer mouse or southern