Flamingo Feeding - Article describing how flamingos, as filter feeders, feed with their heads upside down. - http://www.stanford.edu/group/stanfordbirds/text/essays/Flamingo_Feeding.html
Greater Flamingo: Phoenicopterus ruber - This species is a lanky wading bird known for its distinct pink and crimson plumage, pink legs, and stout, down-turned bill. - http://animals.about.com/od/birds/p/greaterflamingo.htm
Phoenicopterus ruber (Greater Flamingo) - Range, diet, reproduction, and habitat of this species. Includes photos. - http://animaldiversity.ummz.umich.edu/site/accounts/information/Phoenicopterus_ruber.html
Lesser Flamingo (Phoenicopterus minor) - Facts, photos, and videos of the Lesser Flamingo. Discusses diet, habitat, predators, social structure, birth, offspring, and senses. - http://www.thebigzoo.com/Animals/Lesser_Flamingo.asp