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The requested URL /mbrowse/msdb/OriginOfSpecies/description/is/In+the+skeletons+of+the+several+breeds,+the+development+of+the+bones+of+the+face+in+length+and+breadth+and+curvature+differs+enormously. The+shape,+as+well+as+the+breadth+and+length+of+the+ramus+of+the+lower+jaw,+varies+in+a+highly+remarkable+manner. The+caudal+and+sacral+vertebrae+vary+in+number;+as+does+the+number+of+the+ribs,+together+with+their+relative+breadth+and+the+presence+of+processes. The+size+and+shape+of+the+apertures+in+the+sternum+are+highly+variable;+so+is+the+degree+of+divergence+and+relative+size+of+the+two+arms+of+the+furcula. The+proportional+width+of+the+gape+of+mouth,+the+proportional+length+of+the+eyelids,+of+the+orifice+of+the+nostrils,+of+the+tongue+(not+always+in+strict+correlation+with+the+length+of+beak),+the+size+of+the+crop+and+of+the+upper+part+of+the+oesophagus;+the+development+and+abortion+of+the+oil-gland;+the+number+of+the+primary+wing+and+caudal+feathers;+the+relative+length+of+the+wing+and+tail+to+each+other+and+to+the+body;+the+relative+length+of+the+leg+and+foot;+the+number+of+scutellae+on+the+toes,+the+development+of+skin+between+the+toes,+are+all+points+of+structure+which+are+variable. The+period+at+which+the+perfect+plumage+is+acquired+varies,+as+does+the+state+of+the+down+with+which+the+nestling+birds+are+clothed+when+hatched. The+shape+and+size+of+the+eggs+vary. The+manner+of+flight,+and+in+some+breeds+the+voice+and+disposition,+differ+remarkably. Lastly,+in+certain+breeds,+the+males+and+females+have+come+to+differ+in+a+slight+degree+from+each+other. [[[[[images/DarwinsPigeons.gif]]]]]/ was not found on this server.