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Frequency distribution of feeding duration per feeder visit with 4 feeder spaces and at 4 bird ages. 2.3FSO = 2.3 cm/bird feeder space with one fully open feeder shared by 45 birds in a pen; 2.3FST = 2.3 cm/bird feeder space with 3 partially blocked feeders shared by 45 birds in a pen; 4.6FST = 4.6 cm/bird feeder space with 3 partially blocked feeders shared by 45 birds in a pen; and 6.9FST = 6.9 cm/bird feeder space with 3 fully open feeders shared by 45 birds in a pen.
