Abstract

References
1.
DeWitt
J B
(1956 ) J. agric. Fd Chem.
4 , 863
2.
George
J L
Frear
D E H
(1966 ) J. appl. Ecol.
3 , Suppl. 155
3.
Moore
N W
(1965 ) Bird Study
12 , 222
4.
Moore
N W
Tatton
J O'G
(1965 ) Nature, Lond.
207 , 42
5.
Prestt
I
(1965 ) Bird Study
12 , 196
6.
Ratcliffe
D A
(1963 ) Bird Study
10 , 56
7.
Warner
R E
Peterson
K K
Borgman
L
(1966 ) J. appl. Ecol.
3 , Suppl. 223
8.
Wheatley
G A
Hardman
J A
(1965 ) Nature, Lond.
207 , 486
