AnimalsMammalsRodents — Order Rodentia
Eastern Fox Squirrel
Sciurus niger
Incisors have a yellow enamel. Rodents have a total of four incisors.
American Beaver
American Beaver —  Castor canadensis [1]
Colonies of 6+. Burrow in river banks. Family Castoridae.
No image available.
Porcupine —  Erethizon dorsatum [1]
Family Erethizontidae.
No image available.
Pocket Gophers — Family Geomyidae
Has external cheek pouches. Front feet much larger than hind feet.
No image available.
Pocket Mice & Kangaroo Rats — Family Heteromyidae
Has external cheek pouches. Hind feet much larger than front feet.
Roof Rat
Mice & Rats — Family Muridae
Nutria
Nutria —  Myocastor coypus [1,2,3]
Looks like beaver with rat tail. Semiaquatic, nocturnal. Family Myocastoridae.
Eastern Fox Squirrel
Squirrels — Family Sciuridae
Evidence that species is found in Texas:
  1. The Mammals of Texas, Online edition of the book by William B. Davis and David J. Schmidly. Hosted by Texas Tech University. Distribution maps show both confirmed records and general range.
  2. Nonindigenous Aquatic Species (NAS), USGS database query for Collin County.
  3. Rick's iNaturalist observations, nature observations of Richard K. Murphy. Identifications are not necessarily confirmed by other users.