TY  - BOOK
AU  - Tinbergen,Niko
TI  - The Herring gull's world: A study of the social behaviour of birds 
T2  - The New Naturalist
U1  - 598.2 
PY  - 1953///.
CY  - London
PB  - Collins
KW  - AVES MARINAS
KW  - AVES
KW  - COMPORTAMIENTO
KW  - ETOLOGIA
ER  -