Wikipedia: Pika
- Encyclopedia article talks about the habitat, activities, and species of the Pika.
- http://en.wikipedia.org/wiki/Pika

Ochotona Princeps
- Contains pictures, description, and classification information.
- http://animaldiversity.ummz.umich.edu/site/accounts/information/Ochotona_princeps.html

Pikas: Wildlife Notebook Series
- Provides general description for history, food habits, and predators of the hare-like pika.
- http://www.adfg.state.ak.us/pubs/notebook/smgame/pikas.php

American Pika
- Description and drawing of the tail less animal.
- http://www.nature.ca/notebooks/english/pika.htm

Total Yellowstone: Pika
- Image and brief description of the little pika.
- http://www.yellowstone-natl-park.com/pika.htm