TY  - BOOK
AU  - Krebs,J R  .
AU  - Davies,N B  .
TI  - An introduction to behavioural ecology / 
SN  - 0632014989
U1  - 591.51 
PY  - 1981///
CY  - Oxford : 
PB  - Blackwell Scientific Publns. , 
KW  - ECOLOGY
N1  - Includes bibliographical references and index
ER  -