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Fig. 2. Experimental cage. Details: a, white light LED; b, electronic balance for
roost; c, surveillance video camera; d, cage door motor; e, hanging roost; f,
feeder; g, door; h, rope for guillotine door; i, computer-controlled
guillotine door (lower quarter made of elastic rubber to prevent injury). Side
walls are opaque PVC and front, back and top walls are transparent.