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2 Answers

Pygmy Raccoon (Procyon pygmaeus)

Amargosa desert vole (Microtus californicus scirpensis)

Owens Valley vole (Microtus californicus vallicola)

Mexican Hualapai vole (Mustela nigripes)

Tehachapi pocket mouse (Perognathus alticolus inexpectatus)

San Joaquin pocket mouse (Perognathus inornatus inornatus)

No common name (Perognathus longimembris salinensis)

Tulare grasshopper mouse (Onychomys torridus tularensis)

Steller sea lion (Eumetopias jubatus)

Townsend's big-eared bat (Corynorhinus townsendii)

Vancouver Island Marmot (Marmota vancouverensis)

Red Wolf (Canis rufus)

Black-footed ferret  (Mustela nigripes)

Gray bat (Myotis grisescens)

Indiana bat (Myotis sodalis)

Riparian woodrat  (Neotoma fuscipes riparia)

Cedros Island mule deer  (Odocoileus hemionus cerrosensis )

Rice Rate (Oryzomys palustris natator)

California bighorn sheep  (Ovis canadensis californiana)

Pacific pocket mouse  (Perognathus longimembris pacificus)

Key Largo cotton mouse  (Peromyscus gossypinus allapaticola)

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If they are extinct they are extinct.  You question should be reworded to mean 20 mammals most closely to becoming extince.
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