Ecological factors were also probably a precursor to eusociality. For example, the sponge-dwelling shrimp depend upon the sponge´s feeding current for food, termites depend upon dead, decaying wood, and naked mole rats depend upon tubers in the ground. These resources have patchy distributions in the environments of these animals. In places there is a surplus, in others next to nothing. This means that resources must be defended for the group to survive. These requirements make it a necessity to have high social order for the survival of the group.
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