For the ghost and the storm outside
The naked mole-rat is the longest living rodent with a maximum lifespan exceeding 28 years. [Mice live a couple of years.] In addition to its longevity, naked mole-rats have an extraordinary resistance to cancer as tumors have never been observed in these rodents.
Naked mole-rats aren’t likely to win any beauty contests. Some might refer to them as downright ugly, resembling an overcooked hotdog with teeth. Nonetheless, biologists and zoogoers are enchanted with these bizarre rodents.
Naked mole-rats spend virtually their entire lives in the total darkness of underground burrows. Ensconced in the arid soils of Africa, these three-inch-long creatures must continually dig tunnels in search of sporadic food supplies and evade the deadly jaws of snakes. Within this formidable environment, naked mole-rats have broken many mammalian rules and evolved an oddly insect-like social system.
Despite the fact that they burrow underground like moles and have rat-like tails, naked mole-rats are in fact neither moles nor rats. The majority of the species referred to as mole-rats belong instead to the family Bathyergidae and are more closely related to porcupines, chinchillas, and guinea pigs than to their namesakes.
Much like ants, termites, and some bees and wasps, naked mole-rats are considered “eusocial,” or truly social. They live in large colonies, presided over by a queen, in which only the queen and a few select males breed while the rest of the colony—all members of the same family—work together to raise young and maintain the colony.
{ Smithsonian Zoogoer magazine | Continue reading }
Naked mole-rats are the exception to biologists’ one-half rule , which describes the fact that mammals have half as many babies, on average, as they have mammary glands. H. glaber breeding females average 12 mammary glands to feed their 11-16 young, and an odd number of mammaries — nine, 11 or 13 — occurs frequently.
{ Cornell University | Continue reading }
Some of the “hottest” research on naked mole rats today concerns senescence, or aging. Naked mole rats in the lab have reached up to 28 years of age. And it’s not just the controlled environments of their captivity that are doing this. Braude has observed mole rats in the wild that are 17 years and older. But these are the breeders. Lab researchers didn’t realize that in the wild workers only live two or three years. “For a rodent of this size, they are ridiculously long-lived,” said Braude.
{ ScienceDaily | Continue reading | Mole Rats May Hold Key to Human Longevity | NY Times }
