The Apache pocket mouse, bleached earless lizard, sand-treader camel cricket, sand wolf spider, and moth species including "Protogygia whitesandsensis" and "Givira delindae" are among the white animals inhabiting the dunefield. Lighter colored animals blend in with their white surroundings better than darker animals, which helps them to avoid predation, allowing them more time to reproduce. Invertebrates form the largest group with more than 600 species, including varied species of spiders, wasps, beetles and moths. Spider species include Apache jumping spider, burrowing wolf spider, funnel-web spider ("Agelenopsis longistylus"), tarantula, and western black widow spider. Other arachnid species include sand scorpion ("Paruroctonus utahensis"), and wind scorpion. Insect species include white-lined sphinx moth, yucca moth, bleached skimmer dragonfly, tarantula hawk wasp, minor ground mantis, toothpick grasshopper, walking stick, Maricopa harvester ant, and darkling beetle. The Maricopa harvester ant inhabits much of the Southwestern United States and is believed to have the most toxic insect venom in the world. Humans may experience up to four hours of intense pain, while the equivalent of twelve ant stings is capable of killing a rat.  , 246 species of birds have been recorded, including wrens, mockingbirds, and ravens, as well as larger species like roadrunners and raptors. Fourteen species are listed as "common" meaning they may be seen daily but not in large numbers, while the others are seen only a few times each month, each year, or every few years. The most commonly seen species are: mourning dove, turkey vulture, Swainson's hawk, red-tailed hawk, ash-throated flycatcher, Chihuahuan raven, common raven, northern mockingbird, house finch, Brewer's sparrow, black-throated sparrow, white-crowned sparrow, and great-tailed grackle. Cactus wrens have a long white streak over their eyes, a cluster of black spots on their breast, and make a somewhat ratchety call. They build their nests in cacti and feed by hopping under shrubs hunting insects, or picking insects off the radiator grills of parked cars. Birds are usually observed in vegetated areas of the park away from the heart of the dunefield, mainly near the visitor center and the edges of the dunefield, as well as Lake Lucero though it is open to the public only once each month by guided tour.