The New Encyclopaedia Britannica: Macropaedia : Knowledge in depth |
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Page 3
... flight , the following gener- alized speeds , based on level flight in calm air , appear to be sound : 10-20 mph - many small songbirds such as sparrows and wrens 20-30 mph - many medium - sized birds such as thrushes and grackles , and ...
... flight , the following gener- alized speeds , based on level flight in calm air , appear to be sound : 10-20 mph - many small songbirds such as sparrows and wrens 20-30 mph - many medium - sized birds such as thrushes and grackles , and ...
Page 42
... flight is the most im- portant method of locomotion . Modes of flight include flapping , gliding , soaring , or diving ( stooping ) and are used to locate and kill prey , move from perch to perch , or migrate . Adaptations for swift or ...
... flight is the most im- portant method of locomotion . Modes of flight include flapping , gliding , soaring , or diving ( stooping ) and are used to locate and kill prey , move from perch to perch , or migrate . Adaptations for swift or ...
Page 60
... flight intention call , bill dipping ( in water ) , and a scream delivered with the neck straight up and the bill agape . Among the aggressive and sexual displays are a silent lunge on water or land with bill somewhat open , chases that ...
... flight intention call , bill dipping ( in water ) , and a scream delivered with the neck straight up and the bill agape . Among the aggressive and sexual displays are a silent lunge on water or land with bill somewhat open , chases that ...
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20th century adult Africa anemia Anseriformes antibodies antigens areas Asia behaviour bill birds blood group bodhisattva body Bolivia bone boxing Brazil Brazilian breeding broadcasting bryophytes Buddha Buddhist building called Caprimulgiformes centimetres central centre China clotting colonial colour countries cuckoos cultural developed disease display early eggs electrons Eocene falconiforms Family feathers feeding feet female flight forest fossil frequency genera genus gruiform hemoglobin important incubation Indian insects islands known legs Mahāyāna major male marrow metres molt monks nest normal North America owls pair Pāli parrots passerines patterns pelecaniforms penguins percent perch period Piciformes pigeons plasma platelets plumage political population produced programs protein radio red cells region river São Paulo sexes short signal South species sporangium structure Suborder tail television Theravada tion tissue toes tradition trees tropical tube usually Vajrayāna wings woodpeckers World young