On the visual orientation of house-flies in their search of resting sites¹
1963
HECHT, OTTO
Houseflies were introduced into a spacious vault-like box, made mainly of transparent plastic. When half of its floor was covered with black and the other half with white paper, about 2/3 of the flies settled on the black and 1/3 on the white surface. When the floor was covered with black, white and grey paper stripes, most flies were found on the black, fewer on the grey and only small numbers on the white surfaces. When flies were introduced into a Y-shaped device made of transparent plastic, the majority settled in the arm which was darkened by covering it with a black cloth. When the cover was changed to the other arm, flies left the now illuminated arm, but not totally and only gradually.
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