Cassin's Finch (Carpodacus cassinii)
- Photo, taxonomy chart, distribution maps, and life history of this species.
- http://www.mbr-pwrc.usgs.gov/id/framlst/i5180id.html

House Finch (Carpodacus mexicanus)
- Offers a photo and data about this species' habitat and diet.
- http://www.birdsofoklahoma.net/HouseFinch001.htm

Purple Finch (Carpodacus purpureus)
- Provides facts about this bird's physical traits and habits. Includes photos and illustrations.
- http://birds.cornell.edu/bow/purfin/