Project PigeonWatch
- International research project that uses community involvement to compile pigeon mating data. Includes project information, pigeon facts, news and past results, and how to join.
- http://www.birds.cornell.edu/programs/urbanbirds/ubs_PIWMainEN.html

Columba speciosa (Scaled Pigeon)
- Sound recordings of this bird.
- http://animaldiversity.ummz.umich.edu/site/accounts/classification/Columba_speciosa.html

Columba livia (Rock Dove, Common Pigeon)
- Description and biology of this bird, which is native to Europe, North Africa, and southwestern Asia, but is now found worldwide.
- http://animaldiversity.ummz.umich.edu/site/accounts/information/Columba_livia.html

Pink Pigeon (Columba mayeri)
- Illustration, photo, possible reasons for this bird's decline, and facts about recovery efforts.
- http://www.birds.mu/Endemic/PinkPigeon.htm

Wildlife Management of the Feral Pigeon (Columba livia)
- Features research information compiled by Dr. Daniel Haag-Wackernagel about wildlife management, behavior, biomonitoring, and deterring systems. [Some information in German only.]
- http://www.unibas.ch/dbmw/medbiol/haag_1.html