This is a list of the tallest extant birds according to maximum height. Birds range from a tiny bee hummingbird (Mellisuga helenae), which is only 5–6 cm (2.0–2.4 in), to the giant African ostrich (Struthio camelus), almost 280 cm (9.2 ft) in height.
^Davies, S.J.J.F. (2003). "Birds I Tinamous and Ratites to Hoatzins". In Hutchins, Michael. Grzimek's Animal Life Encyclopedia. 8 (2nd ed.). Farmington Hills, MI: Gale Group. pp. 99–101. ISBN0-7876-5784-0.
^Davies, S.J.J.F. (2003). "Rheas". In Hutchins, Michael. Grzimek's Animal Life Encyclopedia. 8 Birds I Tinamous and Ratites to Hoatzins (2nd ed.). Farmington Hills, MI: Gale Group. pp. 69–73. ISBN0-7876-5784-0.
^Parizzi, R. C., Santos, J. M., Oliveira, M. F., Maia, M. O., Sousa, J. A., Miglino, M. A., & Santos, T. C. D. (2008). Macroscopic and microscopic anatomy of the oviduct in the sexually mature rhea (Rhea americana). Anatomia, histologia, embryologia, 37(3), 169-176.
^Davies, S.J.J.F. (2003). "Cassowaries". In Hutchins, Michael. Grzimek's Animal Life Encyclopedia. 8 Birds I Tinamous and Ratites to Hoatzins (2nd ed.). Farmington Hills, MI: Gale Group. pp. 75–79. ISBN0-7876-5784-0
^"Southern Cassowary Species account". Animal Life Resource.
^Wood, T.C. & Krajewsky, C (1996). "Mitochondrial DNA sequence variation among the subspecies of Sarus Crane (Grus antigone)" (PDF). The Auk. 113 (3): 655–663. doi:10.2307/4088986.