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NEST BOXES & REFUGEES FOR WILD GARDEN ANIMALS
OXFORD ORNITHOLOGY SERIES. HARRIERS OF THE WORLD. THEIR BEHAVIOUR AND ECOLOGY
Simmons R.E.
Sintetiza y analiza gran cantidad de información y datos sobre comportamiento y ecología de los aguiluchos del género Circus. Explica una interesante comparación entre los sistemas de cría de los aguiluchos del hemisferio norte y los del hemisferio sur.
