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1 Department of Zoology, University of Minnesota, Minneapolis 14, Minnesota
1. Observations of Loligo pealii have shown the egg mass can stimulate sexual behavior. This stimulus apparently has a visual basis.
2. This stimulus is followed by establishment of a social hierarchy and by mate selection by the males. The males exhibit warning displays, sham battles, and mate protection during this time.
3. Normally the females respond passively but occasionally they will take an aggressive role.
4. This mating behavior results in copulation and egg-laying; thus a method for obtaining naturally laid eggs has been revealed.
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