http://www.birdsinbulgaria.org/

http://www.mariewinn.com/

http://www.camacdonald.com/birding/birding.htm

http://www.inhs.uiuc.edu/chf/pub/ifwis/birds/

http://home.xnet.com/~ugeiser/Birds/Birding.html

http://www.mbr-pwrc.usgs.gov/

http://www.illinoisraptorcenter.org/index.html

http://www.math.sunysb.edu/~tony/birds/mimics.html

http://www.digital-nature-photography.com/nature/voegel/birds.php