Wikipedia:

Gruiformes

Summary:

contains a considerable number of living and extinct bird families with little in common. They are morphologically diverse and geographically widespread. Gruiform means "crane-like." Traditionally, a number of wading and terrestrial bird families ...  (33 of 1945 words, 2 images)

Link:

http://en.wikipedia.org/wiki/Gruiformes  [cite]

Britannica:

gruiform | Gruiformes [order]

Summary:

any member of a rather loose assemblage of 12 families of birds that are generally agreed to be related but that differ widely in many aspects. ...  (26 of 102 words)

Link:

http://www.britannica.com/EBchecked/topic/247347/gruiform  [cite]

Wiktionary:

Gruiformes

Summary:

a taxonomic order, within subclass Neognathae - diverse birds  (9 of 15 words, 1 etymology)

Link:

http://en.wiktionary.org/wiki/Gruiformes  [cite]

Random House:

Aves

Summary:

a class of vertebrates comprising the birds.  (7 of 17 words, pronunciation)

Link:

http://dictionary.infoplease.com/aves  [cite]