THE MO A AND APTER7X, 
207 
Sub-Class L — Eatit^. 
General Characters of Running Birds. — Tlie kiwi-kiwi, 
the moa, cassowary, and ostrich differ from other bii'ds in 
the smooth, iinkeelcd sternum and the short tail; tlie wings 
are rudimentary and the hind legs strong, these birds (ex- 
FiG. 243 — Moa, Palaptei yx, with three Kiwi-kiwi birds. 
cept Apteryx) being runners, and either of large or, as in 
the extinct forms, of colossal size. 
The simplest form is the kiwi-kiwi" or Apteryx of 
New Zealand (Fig. 243), of which there are three or four 
species. It is of the size of a hen, with a long slender beak, 
the nostrils situated at the end of the upper jaw, while tho 
