TY  - BOOK
AU  - Tinbergen,Niko,1907-
AU  - Falkus,Hugh
TI  - Signals for survival
SN  - 0198573499
PY  - 1970///
CY  - Oxford
PB  - Clarendon Press
KW  - Lesser black
KW  - backed gull
KW  - Animal communication
KW  - Birds
KW  - Behavior
N1  - Based on the film'Signals for survival' by Niko Tinbergen and Hugh Falkus, commissioned by the British Broadcasting Corporation
ER  -