Pyrrhula pyrrhula (Eurasian Bullfinch)
- Species account describes the physical traits and natural history of this species.
- http://animaldiversity.ummz.umich.edu/site/accounts/information/Pyrrhula_pyrrhula.html

Bullfinch
- Discusses the rise and fall of the Pyrrhula pyrrhula population and includes facts about its habitat and diet.
- http://www.birdsofbritain.co.uk/bird-guide/bullfinch.htm