- ruby-crowned kinglet
Regulus calendula
- Northern Chuckwalla
Sauromalus ater
- eastern mole
Scalopus aquaticus
- Sand Sturgeon
Scaphirhynchus platorynchus
- Desert Spiny Lizard
Sceloporus magister
- Crevice Spiny Lizard
Sceloporus poinsettii
- Fence Lizard
Sceloporus undulatus
- eastern grey squirrel
Sciurus carolinensis
- eastern grey squirrel
Sciurus carolinensis
- eastern grey squirrel
Sciurus carolinensis
- red-toothed shrews
Soricinae
- Uinta ground squirrel
Spermophilus armatus
- California ground squirrel
Spermophilus beecheyi
- cicada killer
Sphecius speciosus