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Sivu 476
It may be that the birds only ascend thus on radiantly fine mornings ; or only during a short space of the early breeding season ; or that it is a local habit of Oxfordshire birds . That remains to be discovered .
It may be that the birds only ascend thus on radiantly fine mornings ; or only during a short space of the early breeding season ; or that it is a local habit of Oxfordshire birds . That remains to be discovered .
Sivu 477
experiments , showing that with some birds at least it is the changing length of night and day , and not temperature or shortage of food , which is the first link in the chain of causes that brings on the migrants ' impulse to move ...
experiments , showing that with some birds at least it is the changing length of night and day , and not temperature or shortage of food , which is the first link in the chain of causes that brings on the migrants ' impulse to move ...
Sivu 480
In Mr. Chance's remarkable film , " The Cuckoo's Secret , ' occurs an illuminating incident which forcibly reveals the deficiencies of bird mind . The young cuckoo is first seen , in the absence of the old birds , heaving one of the ...
In Mr. Chance's remarkable film , " The Cuckoo's Secret , ' occurs an illuminating incident which forcibly reveals the deficiencies of bird mind . The young cuckoo is first seen , in the absence of the old birds , heaving one of the ...
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American Arab asked become believe better birds British called comes continued course doctor England existence eyes face fact feel followed give groups hand head hold human hundred idea India industrial interest Italy Judge keep kind knew land least leave less light living look matter means ment mind Miss nature never night once organization passed perhaps political possible practice present problem question reason river seems seen side social stand talk tell things thought thousand tion Titus told took trees true turn United whole women York young