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  2. List of longest-living organisms - Wikipedia

    en.wikipedia.org/wiki/List_of_longest-living...

    There are numerous plants and animals for which the mortality rate has been observed to actually decrease with age, for all or part of the life cycle. [2] Hydra were observed for four years without any increase in mortality rate. [3] If the mortality rate remains constant, the rate determines the mean lifespan.

  3. Biological immortality - Wikipedia

    en.wikipedia.org/wiki/Biological_immortality

    All hydra cells continually divide. [15] It has been suggested that hydras do not undergo senescence, and, as such, are biologically immortal. In a four-year study, 3 cohorts of hydra did not show an increase in mortality with age. It is possible that these animals live much longer, considering that they reach maturity in 5 to 10 days. [16]

  4. Hydra (genus) - Wikipedia

    en.wikipedia.org/wiki/Hydra_(genus)

    Hydra (/ ˈ h aɪ d r ə / HY-drə) is a genus of small freshwater hydrozoans of the phylum Cnidaria.They are solitary, carnivorous jellyfishlike animals, [2] native to the temperate and tropical regions.

  5. List of maximum animal lifespans in captivity - Wikipedia

    en.wikipedia.org/wiki/List_of_maximum_animal...

    This is a list of maximum recorded animal lifespans in captivity. Only animals from the classes of the Chordata phylum are included. [1] On average, captive animals (especially mammals) live longer than wild animals.

  6. Maximum life span - Wikipedia

    en.wikipedia.org/wiki/Maximum_life_span

    Rats, mice, and hamsters experience maximum life-span extension from a diet that contains all of the nutrients but only 40–60% of the calories that the animals consume when they can eat as much as they want. Mean life span is increased 65% and maximum life span is increased 50%, when caloric restriction is begun just before puberty. [57]

  7. Sphynx Cats Have Lowest Life Expectancy, Study Shows - AOL

    www.aol.com/lifestyle/sphynx-cats-lowest-life...

    The average life expectancy of all domestic cat breeds was 11.7 years. Crossbreeds and Siamese came very close to that mark at 11.9 and 11.7 years, respectively.

  8. Turritopsis dohrnii - Wikipedia

    en.wikipedia.org/wiki/Turritopsis_dohrnii

    Turritopsis dohrnii, also known as the immortal jellyfish, is a species of small, biologically immortal jellyfish [2] [3] found worldwide in temperate to tropic waters. It is one of the few known cases of animals capable of completely reverting to a sexually immature, colonial stage after having reached sexual maturity as a solitary individual.

  9. Hydra vulgaris - Wikipedia

    en.wikipedia.org/wiki/Hydra_vulgaris

    Hydra oligactis. This species can reproduce in three ways: sexual reproduction, budding, and indirectly through regeneration. [11] When hydra reproduce sexually, simple testes, ovaries, or both will develop on the bodies of an individual. Sperm released into the environment by the testes enters the egg within the ovary.