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1. The progress of feather pecking and cannibalism was recorded from hatching to end of lay in a flock of caged layers and the influence of group size, floor area allowance and cage tier upon the incidence of these activities during lay assessed.
2. The largest group suffered more cannibalism and feather pecking than smaller groups, floor area allowance and tier being less important factors.
3. A significant trend was found for one death from cannibalism to be followed by more in the same cage.
4. It was concluded that feather pecking and cannibalism are separate phenomena, although the same cage conditions increased the incidence of both.
5. Cannibalism may be divided into vent pecking and cannibalism affecting other parts of the body, the former is independent of feather pecking and the latter, though usually preceded by feather pecking, is only indirectly associated with it.