Grzimek Mammals
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- black-lipped pika
Ochotona curzoniae
- black-lipped pika
- northern pika
Ochotona hyperborea
- northern pika
- large-eared pika
Ochotona macrotis
- large-eared pika
- Pallas's pika
Ochotona pallasi
- Pallas's pika
- American pika
Ochotona princeps
- American pika
- steppe pika
Ochotona pusilla
- steppe pika
- Afghan pika
Ochotona rufescens
- Afghan pika
- Turkestan red pika
Ochotona rutila
- Turkestan red pika
- degu
Octodon degus
- degu
- mountain degu
Octodontomys gliroides
- mountain degu
- viscacha rat
Octomys mimax
- viscacha rat
- walrus
Odobenus rosmarus
- walrus
- walrus
Odobenus rosmarus
- walrus
- walrus
Odobenus rosmarus
- walrus
- okapi
Okapia johnstoni
- okapi