Tortoise

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tortoise : any of a family (Testudinidae) of terrestrial turtles — Webster

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Tortoises are a family, Testudinidae. Testudinidae is a Family under the order Testudines and suborder Cryptodira. There are fourteen extant families of the order Testudines, an order of reptile commonly known as turtles, tortoises, and terrapins. The suborder Cryptodira is a suborder of Testudines that includes most living tortoises and turtles. Cryptodira differ from Pluerodia in that they lower their necks and pull the heads straight back into the shells, instead of folding their necks sideways along the body under the shells’ marginals. The testudines are some of the most ancient reptiles alive. Tortoises are shielded from predators by a shell. The top part of the shell is the carapace, the underside is the plastron, and the two are connected by the bridge.

The carapace is fused to both the vertebrae and ribcage, and tortoises are unique among vertebrates in that the pectoral and pelvic girdles are inside the ribcage rather than outside. Tortoises can vary in dimension from a few centimeters to two meters. They are usually diurnal animals with tendencies to be crepuscular depending on the ambient temperatures. They are generally reclusive animals. Tortoises are the longest living land animal in the world, although the longest living species of tortoise is a matter of debate. Galápagos tortoises are noted to live over 150 years, but an Aldabra giant tortoise named Adwaita may have been the longest living at an estimated 255 years. In general, most tortoise species can live 80–150 years. — Wikipedia

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Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

  • How mapping the Galápagos could create more...
    on December 12, 2018 at 1:20 pm

    The Galápagos Islands remain one of the most biodiverse spots on the planet—with tortoises, finches and iguanas dotting just 3,000 square miles of land. […]

  • In death, Lonesome George reveals why giant...
    on December 3, 2018 at 4:00 pm

    Lonesome George's species may have died with him in 2012, but he and other giant tortoises of the Galapagos are still providing genetic clues to individual longevity through a new study by researchers at Yale University, the University of Oviedo in Spain, the Galapagos Conservancy, and the Galapagos National Park Service. […]

  • Why do some plants live fast and die young?
    on November 28, 2018 at 7:00 pm

    An international team led by researchers at The University of Manchester have discovered why some plants "live fast and die young" whilst others have long and healthy lives. […]

  • Capturing the frugal beauty of complex natural...
    on November 21, 2018 at 5:06 pm

    Surface tessellations are an arrangement of shapes which are tightly fitted, and form repeat patterns on a surface without overlapping. Imagine the pattern of a giraffe's fur, the shell of a tortoise and the honeycomb of bees—all form natural tessellations. Mimicking these natural designs computationally is a complex, multi-disciplinary problem. A global team of computer scientists has developed a new, alternate model for replicating these intricate surface designs, veering away from […]

  • Jodrell Bank Observatory release 50 year-old...
    on November 14, 2018 at 3:19 pm

    Jodrell Bank is releasing audio recordings of a Soviet space mission from fifty years ago, just as the race to the moon was approaching the finish line. […]