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  2. Axolotl - Wikipedia

    en.wikipedia.org/wiki/Axolotl

    The axolotl (/ ˈ æ k s ə l ɒ t əl / ⓘ; from Classical Nahuatl: āxōlōtl [aːˈʃoːloːtɬ] ⓘ) (Ambystoma mexicanum) [3] is a paedomorphic salamander closely related to the tiger salamander. [3] [4] [5] It is unusual among amphibians in that it reaches adulthood without undergoing metamorphosis. Instead of taking to the land, adults ...

  3. Why Axolotls are Slowly Disappearing

    www.aol.com/why-axolotls-slowly-disappearing...

    The axolotl can grow up to 12 inches and weigh anywhere from three to eight pounds, and its average lifespan in the wild is 10-15 years. Most axolotls are dark brown with some black speckling, but ...

  4. Xolotl - Wikipedia

    en.wikipedia.org/wiki/Xolotl

    The name "Axolotl" comes from Nahuatl, the Aztec language. One translation of the name connects the Axolotl to Xolotl. The most common translation is "water-dog" . "Atl" for water and "Xolotl" for dog. [14] In the Aztec calendar, the ruler of the day, Itzcuintli ("Dog"), is Mictlantecuhtli, the god of death and lord of Mictlan, the afterlife. [15]

  5. Sexual dimorphism - Wikipedia

    en.wikipedia.org/wiki/Sexual_dimorphism

    The female-biased sexual size dimorphism observed in many taxa evolved despite intense male-male competition for mates. [28] In Osmia rufa , for example, the female is larger/broader than males, with males being 8–10 mm in size and females being 10–12 mm in size. [ 29 ]

  6. Mole salamander - Wikipedia

    en.wikipedia.org/wiki/Mole_Salamander

    The mole salamanders (genus Ambystoma) are a group of advanced salamanders endemic to North America. The group has become famous due to the study of the axolotl (A. mexicanum) in research on paedomorphosis, and the tiger salamander (A. tigrinum, A. mavortium) which is often sold as a pet, and is the official amphibian of four US states.

  7. 'Adopt an axolotl' campaign launches in Mexico to save iconic ...

    www.aol.com/news/adopt-axolotl-campaign-launches...

    Virtual adoption comes with live updates on your axolotl’s health. In their main habitat the population density of Mexican axolotls (ah-ho-LOH'-tulz) has plummeted 99.5% in under two decades ...

  8. XO sex-determination system - Wikipedia

    en.wikipedia.org/wiki/XO_sex-determination_system

    XO sex determination can evolve from XY sex determination within about 2 million years. [clarification needed] It typically evolves due to Y-chromosome degeneration.As the Y-chromosome is not paired (though see pseudoautosomal region), it is susceptible to decay by Muller's ratchet.

  9. Trump's definition of 'male,' 'female' criticized by medical ...

    www.aol.com/trumps-definition-male-female...

    The executive order declares there are only "two sexes, male and female" and defines a "female" as "a person belonging, at conception, to the sex that produces the large reproductive cell." The ...