TY  - BOOK
AU  - Tinbergen, Nikolaas
TI  - The herring gull's world [rev. ed.]: a study of the social behaviour of birds
U1  - 598.2 
PY  - 1960///
CY  - New York
PB  - Basic Books
KW  - Herring - Gull
KW  - Birds -- Habits and behaviour
N1  -  illustrated
ER  -