130 CHAFI'IIfCnES. 



hatclied, and that the old ones do not feed them, but only 

 lead them about at the time of feeding, which, for the most 

 part, is in the night." Thus far my Mend. 



In the manners of this bird, you see, there is something 

 very analogous to the bustard, whom it also somewliat 

 resembles in aspect and make, and in the structure of its feet. 



For a long time I have desired my relation to look out for 

 these birds in Andalusia ; and now he writes me word that, 

 for the first time, he saw one dead in the market on the 3rd 

 of September. 



When the oedicnemus flies, it stretches out its legs straight 

 behind, Kke a heron. 



LETTEE XLI. 



TO THE HON". DAINES BAEEINGTON. 



Selboene, Dec. 20, 1770. 

 Deae Sib, — The birds that I took for aberdavines were 

 reed-sparrows (jpasseres torquati). 



There are, doubtless, many home internal migrations within 

 this kiagdom that want to be better understood; witness 

 those vast flocks of hen chafiiaches that appear with us m 

 the winter without hardly any cocks among them. Now, 

 were there a due proportion of each sex, it would seem very 

 improbable that any one district should produce such num- 

 bers of these little birds, and much more when only one half 

 of the species appears ; therefore we may conclude that the 

 fringillce ccelebes, for some good piu-poses, have a pecuhar 

 migration of theic own, in which the sexes part. Nor should 

 it seem so wonderful that the intercourse of sexes in this 

 species of birds should be interrupted in winter ; since in 

 many animals, and particularly in bucks and does, the sexes 

 herd separately, except at the season when commerce is 

 necessary for the contmuance of the breed. Eor this matter 

 of the chaffinches, see Famia Suecica, p. 85, and Bystema 



