But it was now made to appear that the struthious birds in this respect resembled, not only the duck, but a great many other groups - waders, birds-of-prey, pigeons, passerines and perhaps all birds not gallinaceous - so that, according to Cuvier's view, the five points of ossification observed in the Gallinae, instead of exhibiting the normal process, exhibited one quite exceptional, and that in all other birds, so far as he had been enabled to investigate the matter, ossification of the sternum began at two points only, situated near the anterior upper margin of the side of the sternum, and gradually crept towards the keel, into which it presently extended; and, though he allowed the appearance of detached portions of calcareous matter at the base of the still cartilaginous keel in ducks at a certain age, he seemed to consider this an individual peculiarity. [Please select]
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Fluctuation of territorial boundaries is not uncommon in passerines, especially when no rivals exist to contest movement. [Please select]
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According to Andrew (1956:179), flicking of wing and tail in passerines are intention movements of flight. [Please select]
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Lack (1947:308-309) indicates that in European passerines the highest seasonal average clutch-sizes likewise occur in June. [Please select]
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Bailey (1952:128) suggests that male passerines lacking brood patches that habitually sit on eggs do not heat the eggs. [Please select]
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INCIDENCE OF COWBIRD PARASITISM OF THE BELL VIREO COMPARED WITH OTHER PASSERINES IN THE STUDY AREA IN 1959 AND 1960. [Please select]
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Intention movements of flight in certain passerines, and their use in systematics. [Please select]
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