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ON LOCOMOTORY MOVEMENTS IN BIRDS AND THE INTENTION MOVEMENTS DERIVED FROM THEM by A. DAANJE (Eindhoven, Holland) (adapted from the original Dutch manuscript by N. TINBERGEN) (With 39 figures) (Rec. 2-V-1950) I INTRODUCTORY As all observers of animal behaviour know, many activities may occa- sionally be performed incompletely. This is especially true of locomotory movements. Walking, for instance, in a bird, may be seen in numerous degrees of intensity, arrangeable in a sliding scale from full intensity down to an almost imperceptible indication of it. HEINROTH seems to have been the first to have called attention to these low intensity
A. Daanje (Mon,) studied this question.