the diurnal inequality is shown for " winter " and " summer " respectively.
Some are nocturnal, some diurnal; some catch their prey by speed of foot, some by cunningly lying hid, some by means of silken nets.
This is one of the reasons why in the figures for the annual and diurnal variations in Tables I., II.
He also found a marked diurnal variation, A being considerably greater between 3 and 5 A.M.
Thus he separates the birds of prey into three great groups - (I) the ordinary Diurnal forms, including the Falconidae and Vulturidae of the systematist of his time; but distinguishing the American Vultures from those of the Old World; (2) Gypogeranus, the secretary-bird; and (3) the owls (q.v.).