on the Migration of Birds. 127 
fpace of a fingle day ; and befides, they never feem to be tired or 
lifelefs, but are very brifk and lively. 
Sterna Hirundo & Sterna minuta—Sea Swallows. 
Thefe birds are, as I fuppofe, fummer birds of paffage; appearing 
on our fea-coafts about April or May, and continuing with us till 
the autumn. The earlieft that I have obferved the great Sea Swal- | 
low, Sterna Hirundo, was the 15th of April; the leffer, or Sterna 
minuta, the 24th of April; and the black Sea Swallow, Sterna fifi- 
pes? is fo rare, that in fixteen years I obferved it but once, and that 
was on the 28th of April. 
As to the time of their leaving us, I cannot fpeak with any cer- 
tainty. I once faw the leffer Sea Swallow fo late as the 1 5th of October. 
Motacilla Atricapilla—rhe Black Cap, 
Sings very prettily, and has a note fomewhat like the Nightingale; 
for when I firft heard it, I took it for that bird, till I had feen it. 
Charadrius Oedicnemus—vhe Stone Curlew, . 
 Whiftles in the evening. I heard this bird June 17th, 1770, 
amongft the corn on the downs not far from Eaftbourn, where I 
fuppofe it breeds. 
Corvus Corax—the Raven. . 
There feems a wonderful antipathy between this SR and the 
Corvus frugilegus, or Rook. In the year 1778, as foon as a Raven : 
had built her neft in a tree adjoining to a very numerous rookery, 
all the Rooks immediately forfook the fpot, and have not returned 
to build there fince. 
At the Bifhop of Chichefter's rookery at Broomham near Haft- 
ings in Suflex, upon a Raven’s building her neft in one of the 
2, trees, 
