Bibliographie
http://fr.encyclopedia.yahoo.com/articles/so/so/_3021_po.html
http://webserv.nhi.ni/nribot/english/rate_ng.htm
http://aviaey.owls.com/toucan/toucan.html
www.blueplanetbiomes.org/toco-toucan.htm
www.eprurray.usnet.ch/3p-2eure_vdee/o-le_toucan.htm