94 ELEMENTS OF ORNITHOLOGY, 
(Coracias garrula, fig. 100), which tumbles in the air somewhat 
hike a Tumbler-pigeon, is a very handsome bird which is common 
in the South of Europe, and occasionally visits England. It is 
the type of a group of bright-coloured Birds which extend south- 
wards to Australia, the Malayan region, and Madagascar, but 
Fig. 97. 

The Hoatzin (Opisthocomus cristatus). 
are absent from the New World. There are twenty-four species 
in the family. An allied form from Madagascar, called the 
Cyrombo (Leptosoma discolor), has a similar tumbling habit and 
a peculiar condition of the nostrils. 
That very familiar Bird the House-martin (Chelidon urbica) 
