TY  - BOOK
AU  - Tinbergen,Niko
AU  - Falkus,Hugh
TI  - Signals for survival
SN  - 0198573499
AV  - QL696.L3 T53
U1  - 598.3/3 
PY  - 1970///
CY  - Oxford
PB  - Clarendon Press
KW  - Lesser black-backed gull
KW  - Local
KW  - Birds
KW  - Behavior
KW  - Animal communication
N1  - Based on the film "Signals for survival" by Niko Tinbergen and Hugh Falkus, commissioned by the British Broadcasting Corporation; Bibliography: p. 80
ER  -