108 HABITS AKD MIGBATIOtf. 



beak, so must its construction be modified ac- 

 cording to the conformation of the blossoms 

 from which any species respectively is destined 

 to draw its sustenance. 



We do not learn that any Humming-birds are 

 social or gregarious, as are the Weaver-birds of 

 Africa and India, and so many of our native 

 species; but vast numbers are sometimes seen 

 in company together, attracted by some favourite 

 object to a common focus. Mr. Grosse states 

 that two large tamarind trees near his house, in 

 full blossom, proved such a centre of attraction 

 to the VERVAIN HUMMING-BIBD. They flocked 

 together like a swarm of bees intent upon the 

 flowers, and the air resounded with their hum- 

 ming as if in the neighbourhood of a hive. 

 None, however, establish colonies, or build their 

 nests in social groups, or act together. Indivi- 

 duals or pairs pursue an independent course. 

 Multitudes may, indeed, sometimes be seen dart- 

 ing about on rapid wings, as in the case of our 

 common Swallow (Hirunda rustica) ; but for all 

 that, the Swallow cannot be said to be social in 

 its habits ; for each pair nidificates apart from 

 any other. The House-martin is social, to a 

 great extent at least, and the Sand-martin 

 more so. 



Most, if not all, migratory birds congregate 

 together before the time of departure, and so 

 united pursue their course : the Swallows, the 

 Wheatears, the Quails, and many more, might 



