Silver Page 40: Mrs. Nacktmull’s Tale
Paul gets in touch with Felix Cranberry's neighbor, who is the last person who saw Joy and Felicity.

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The naked mole rat (Heterocephalus glaber), also known as the sand puppy or desert mole rat, is not threatened, but it's interesting enough to rate an appearance in Silver!

The species is one of only two known eusocial mammals (the other being the Damaraland mole rat) with a social struture similar to that found in ants, termites, and some bees and wasps. Only one female (the queen) and one to three males reproduce, while the rest of the members of the colony are sterile and function as workers.

The sand puppy also has a highly unusual set of physical traits that enables it to thrive in an otherwise harsh, underground environment, including a lack of pain sensation in its skin and a very low metabolism. As you can see, there were many reasons for Mrs. Nacktmull to run away and built a nice little bungalow in Treetown where she lives in peaceful solitude with her pet cat.