Sex differences in cooperative silk-spinning by weaver ant larvae

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Abstract
Final-instar larvae of weaver ants (O. longinoda) use their silk for nest construction rather than for cocoon spinning; this commitment represents a shift from entirely selfish to entirely cooperative behavior that occurred after the emergence of the phylogenetically advanced subfamily Formicinae. Male larvae have smaller silk glands and contribute substantially less silk to nest construction. The hypothesis of kin selection may be the most plausible and parsimonious explanation of this sex difference, but other, individual-level modes of selection have not been eliminated.