. The animans and man; an elementary textbook of zoology and human physiology. ing habits in common asdistinguished from the all-year residents. Observe the behav- s. ior of the birds incourting time. Dothe males have sing-ing contests, as issometimes reported ?Do they fight witheach other? Do themales or females showany differences, at thistime, from their moreusual plumage ? Aftermating which birdselects the nestingsite ? Are old nestingsites preferred to newones? If two broodsare reared is a newnest built? What arethe principal causesof mortality amongthe eggs and youngduring the breeding S
. The animans and man; an elementary textbook of zoology and human physiology. ing habits in common asdistinguished from the all-year residents. Observe the behav- s. ior of the birds incourting time. Dothe males have sing-ing contests, as issometimes reported ?Do they fight witheach other? Do themales or females showany differences, at thistime, from their moreusual plumage ? Aftermating which birdselects the nestingsite ? Are old nestingsites preferred to newones? If two broodsare reared is a newnest built? What arethe principal causesof mortality amongthe eggs and youngduring the breeding Season? What in- FlG- 117- Razorbill auk and egg. (Drawn. ,. from photograph made from life.) stmcts or habits of the parents have direct reference to these dangerous conditions ?What means of protecting the nest are resorted to ? What isthe behavior of the parents towards enemies of the young ?The field-study of the birds of a given locality will comprisemuch observation bearing directly on their distribution orspecial habitat. Certain birds will be found to be limited to. 224 THE ANIMALS AND MAN certain parts of even a small region; the swimmers will befound in ponds and streams, and the long-legged shore-birdson the pond- or stream-banks, or in the marshes and wetmeadows, although a few, like the upland-plover, curlews,and godwits are common on the dry upland pastures. Dis- TT
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Keywords: ., bookcentury1900, bookd, booksubjectphysiology, booksubjectzoology
