. A history of British birds . e in some way connectedwith the birds habit, as described, of taking its prey underwater : for, as will subsequently be mentioned, species whosenature it is to seek their food by diving, and are therebysubjected to a greater or less amount of pressure in pro-portion to the depth of water, not unfrequently undergo aconsiderable modification of this part of the sternum as com-pared with those nearest to them in general structure, butnot so expert in their subaquatic feats. By an extended examination of the different species ofBuzzards and Harriers, it will be found
. A history of British birds . e in some way connectedwith the birds habit, as described, of taking its prey underwater : for, as will subsequently be mentioned, species whosenature it is to seek their food by diving, and are therebysubjected to a greater or less amount of pressure in pro-portion to the depth of water, not unfrequently undergo aconsiderable modification of this part of the sternum as com-pared with those nearest to them in general structure, butnot so expert in their subaquatic feats. By an extended examination of the different species ofBuzzards and Harriers, it will be found that the charactersdescribed as necessary to produce rapid flight decline gra-dually. The sternum decreases in size, the keel loses partof its depth and the coracoid bones and furcula become moreslight. A representation of the sternum of a Vulture has alreadybeen given and that of an Owl will be immediately inserted,to afford a comparative view of the size and structure of thesame parts in these Families of the 146 ACCIPITRES. STRIGID-E. STRIGlDJi.
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Keywords: ., bookauthorsaun, bookcentury1800, bookdecade1870, booksubjectbirds
