| SCIENTIFIC NAME | COMMON NAME | LOCATION IN PIMA COUNTY | DISTRIBUTION | HABITAT FOUND | COMMENTS |
| Didelphis marsupialis var. mexicana | Mexican Opossum | Eastern (Arivaca area) | Northern edge of range; species is expanding its range from Mexico | Various | Not a species of concern, probably a natural range expansion |
| Mus musculus | House Mouse | Eastern | Widely distributed in urban settings | Urban - will expand into natural settings during population explosions; Agricultural areas | Not much concern - doesn't compete with natives |
| Homo sapiens | Humans | Eastern/Western | Global | ||
| Canis spp. | Dogs | Eastern (urban periphery) | Global | ||
| Felis spp. | Cats | Eastern (urban periphery | Global | ||
| Bos taurus | Cattle | Eastern/Western | Global | ||
| Sus scrofa | Pig | Eastern | Global | Riparian | San Pedro River |
| Sturnus vulgaris | Starlings | Eastern | Saguaro cavities (mostly in developed areas) | ||
| Pennisetum ciliare | Buffel Grass | Eastern/Western | African origin; increasing in Mexico; invades from disturbed areas along roadways | Grasslands | Very bad for bird species in grassland communities |
| Ctenosaura pectinata | Spiny-tailed Iguana | Eastern (records near Sonoran Desert Museum and Catalina Mtns.) | Sonora | Aquatic | Not likely to spread according to some sources |
| Trachemys scripta | Slider Turtle | Aquatic | Expansion from urban ponds; released by humans | ||
| Pscudemys spp. | Red-bellied Turtle | Aquatic | Known from Maricopa County, not verified in Pima County; Expansion from urban ponds; released by humans | ||
| Chrysemys picta | Painted Turtle | Aquatic | " | ||
| Pseudemys concinna | Cooters | Aquatic | " | ||
| Graptemys spp. | Map Turtles | Aquatic | " | ||
| Chelydra serpentina | Snapping Turtle | Aquatic | " | ||
| Macrodemys temmrachi | Alligator Snapping Turtle | Aquatic | " | ||
| Trionye or Apalone spinefera | Spiny Softshell Turtle | Aquatic | Bad for native fish | ||
| Xenopus laevis | African Clawed Frog | Aquatic | Bad for native fish | ||
| Rana berbudieri | Rio Grande Leopard Frog | Aquatic | May arrive in Pima County via CAP Canal; may outcompete native leopard frogs | ||
| Rana catesbeiana | Bullfrog | Eastern | Aquatic | Efforts are underway to combat problem | |
| Ambystoma tigrinum | Tiger Salamander | Eastern | Aquatic | No natives to compete with; may cause damage to pupfish and topminnow populations | |
| Gambusia affinis | Mosquito Fish | Eastern | |||
| Orconecta virilus and others | Crayfish | Eastern | Aquatic | Jeanette Carpenter (USGS) is studying these | |
| Yellow Bullhead | Found in isolated water bodies | Aquatic | |||
| Black Bullhead | Aquatic | Check with Will Hayes AGFD | |||
| Lepomis cyanellus | Green Sunfish | Eastern (Sabino Canyon) | Aquatic | ||
| Corbicula | Asian Clam | ||||
| Helix aspersa | Escargot Snail | Eastern | Widely distributed in residential areas | ||
| Viviparus chinensis | Mystery Snail | Southeastern | Aquatic (cold water); does not like warm water | Introduced in aquarium trade | |
| Otala Lactea | snail | Gardens | |||
| Rumina decollata | snail | Gardens | |||
| Lamellaxis gracilis | snail | Gardens | |||
| Oxychilus draparnaldi | snail | Gardens; Plant Nurseries | |||
| Limax valentianus | snail | Aquatic | |||
| Vallonia pulchella | snail | Land | |||
| Radix auricularia | snail | Aquatic | |||
| Pseudosuccinea columella | snail | Aquatic | |||
| Biophalaria havanensis | snail | Aquatic | |||
| Succinea campestris | snail | Western | Very isolated | ||
| Apis melliflera | Honey Bee | Eastern/Western | Widespread | Desert; riparian | Includes Africanized and European bees |
| Tamarix chinensis | Tamarisk | Eastern/Western | Riparian | ||
| Eragrostis lehmaniana | Lehman's Lovegrass | Eastern | Grasslands | Abundance of this grass depresses natives; affects fires | |
| Brassica tournefortii | Sahara Mustard | Western (Cabesa Prieta, Pinta Sands) | Widely | ||
| African Daisy | Eastern (Tucson Mtns and Santa Cruz River) |
Displaces native annuals; plant to watch out for | |||
| Euryops multifidus | Sweet Resin Bush | Santa Rita Experimental Range | |||
| Pennisetum setaceum | Fountain Grass | ||||
| Erodium cicutorium | Filaree | ||||
| Bromus rubens | Red Brome | ||||
| Salvinia | Aquatic | Exotic that displaces native aquatic ecosystems |