Grzimek Mammals
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- Allen's big-eared bat
Idionycteris phyllotis
- Allen's big-eared bat
- long-eared scaly-tailed flying squirrel
Idiurus macrotis
- long-eared scaly-tailed flying squirrel
- pygmy scaly-tailed flying squirrel
Idiurus zenkeri
- pygmy scaly-tailed flying squirrel
- Longman's beaked whale
Indopacetus pacificus
- Longman's beaked whale
- indri
Indri indri
- indri
- indris, sifakas, and relatives
Indriidae
- indris, sifakas, and relatives
- Amazon river dolphin
Inia geoffrensis
- Amazon river dolphin
- Chilean climbing mouse
Irenomys tarsalis
- Chilean climbing mouse
- northern brown bandicoot
Isoodon macrourus
- northern brown bandicoot
- yellow-crowned brush-tailed rat
Isothrix bistriata
- yellow-crowned brush-tailed rat
- Atlantic bamboo rat
Kannabateomys amblyonyx
- Atlantic bamboo rat
- painted bat
Kerivoula picta
- painted bat
- rock cavy
Kerodon rupestris
- rock cavy
- waterbuck
Kobus ellipsiprymnus
- waterbuck
- Nile lechwe
Kobus megaceros
- Nile lechwe