- Bobrinski's jerboa
Allactodipus bobrinskii
- Allen's swamp monkey
Allenopithecus nigroviridis
- hairy-eared dwarf lemur
Allocebus trichotis
- black howler monkey
Alouatta caraya
- mantled howler monkey
Alouatta palliata
- red howler monkey
Alouatta seniculus
- silver mountain vole
Alticola argentatus
- Hottentot golden mole
Amblysomus hottentotus
- Harris's antelope squirrel
Ammospermophilus harrisii
- Madras tree shrew
Anathana ellioti
- Andean mouse
Andinomys edax
- Lord Derby's scaly-tailed squirrel
Anomalurus derbianus
- Pel's scaly-tailed squirrel
Anomalurus pelii
- dwarf scaly-tailed squirrel
Anomalurus pusillus