prairie vole, flatworm, bilaterally symmetrical, mus musculus, wolf spider, insectivore, geochelone, rotifer, planarian, bufo, monotremes, quadrupedal, sifaka, peromyscus, dimorphic, unisexual, hyrax, mole rat, pan troglodytes, melanistic, pipefish, spiny anteater, arthropod, ciliates, nematode worm, canid, phalarope, protozoan, woodrat, gila monster, hawk moth, agouti, pelage, mantids, binturong, isopod, felis, whiptail, copulatory, ambystoma, cowbird, baculum, springtails, domesticus, spotted hyena, cavefish, prokaryote, lungless, proboscis monkey, unicellular, homo habilis, tyrannosaurus, gastropod, lagomorphs, erectile tissue, americanus, robustus, auklet, ameba, amphioxus, elegans, tree shrew, parthenogenetic, lubber, carpenter bee, comb jelly, morphologically, australis, canis lupus, outbred, caracara, junco, granulosa, germanica, genus plasmodium, sabertooth, versicolor, chimaera, crinoid, lacewing, totipotent, gall wasp, tadpole shrimp, grackle, crocodilian, vulpes, ectoderm, jawless fish, indri, guanacos, hornworm, ichthyosaurs, endosymbiosis, musculus, flatfishes, gonadal, tobacco hornworm, psittacosaurus, pileated, assortative mating, phylogenetically, planaria

field mouse, vole

meadow mouse, microtus pennsylvaticus