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Naked mole rat
Naked mole rats have a complex social structure in which only one female (the queen) and one to three males reproduce, while the rest of the members of the colony function as workers. As in certain bee species, the workers are divided along a continuum of different worker-caste behaviors instead of discrete groups[1]. Some function primarily as tunnelers, expanding the large network of tunnels within the burrow system, and some primarily as soldiers, designed to protect the group from outside predators.
Evolution has benefited naked mole-rats by ridding them of a body chemical called Substance P, a neurotransmitter released by pain fibers that send signals to the central nervous system in mammals after making contact with things that cause long-lasting, achy pain.
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Naked mole-rats, native to east-central Africa, developed a protective reaction to acids through evolution. Living in tight underground quarters, the mole-rats exhale high levels of carbon dioxide, which becomes acid when it touches skin and mucous tissue in the nose, eyes and mouth. But the mole-rats have evolved to become desensitized to the stinging pain of acid.