72 
NATURAL HISTORY OF SELBORNE. 
to endeavour to trace from whence tliey come, and to enquire 
why they make so very short a stay. 
In your account of your error with regard to the two species 
of herons, you incidentally gave me great entertainment in your 
description of the heronry at Cressi-hall, which is a curiosity I 
never could manage to see. Fourscore nests of such a bird on 
one tree is a rarity which I would ride half as many miles to 
have a sight of. Pray be sure to tell me in your next whose 
seat Cressi-hall is, and near what town it lies.* I have often 
thought that those vast extents of fens have never been suffi- 
ciently explored. If half a dozen gentlemen, furnished with a 
good strength of water-spaniels, were to beat them over for a 
week, they would certainly find more species. 
There is no bird, I believe, whose manners I have studied 
more than that of the cajorimulgus (the 
goat-sucker),t as it is a wonderful and 
curious creature : but I have always 
found that though sometimes it may 
chatter as it flies, as I know it does, 
yet in general it utters its jarring note 
sitting on a bough ; and I have for 
many a half hour watched it as it sat 
. T . , . . ^ Motheater. 
With its under mandible quivering, and 
particularly this summer. It perches usually on a bare twig, 
vrith its head lower than its tail, in an attitude well expressed by 
your draughtsman in the folio British Zoology. This bird is 
most punctual in beginning its song exactly at the close of day ;X 
so exactly that I have known it strike up more than once or 
twice just at the report of the Portsmouth evening gun, which 
we can hear when the weather is still. It appears to me past all 
doubt that its notes are formed by organic impulse, by the 
powers of the parts of its windpipe, formed for sound, just as 
* Cressi-hall is near Spalding-, in Lincolnshire. 
t A better name is motheater (phalaojiivora curopcca), the whole structure of the birds of this 
genus being especially adapted for prcj'ing on nocturnal insects. — En. 
t I remember once hearing it, however, at about four o'clock in the afternoon, during bright 
sunshine, but such an occurrence is very unusual. Perhaps it may be as well to remark here, 
in reference to an erroneous statement in Capt. Brown's edition of this work, that our bird is 
by no means identical with the whip-poor-will motheater of America (phaloenivora vocifera), a 
species peculiar to that continent, and common in summer in many parts of the United States, 
where it literally makes the woods resound at night with its perpetual repetition ef the note 
from which it has been named, pronounced in a very clear and distinct manner, the chief stress 
being laid on the first and last syllables. Our bird has only the notes above mentioned by Mr. 
White —the loud spinning-wheel burr, and an occasional faint squeak, which latter is on.y uttered 
on the wing. — Ed. 
