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Size of three Yutyrannus specimens compared to a human. Yutyrannus was a large bipedal predator. The holotype and oldest-known specimen has an estimated length of 9 metres (29.5 ft) and an estimated weight of about 1,414 kilograms (3,117 lb). [1] In 2016, Gregory S. Paul gave lower estimations of 7.5 metres (24.6 ft) and 1.1 tonnes (1.2 short ...
Nevus anemicus is a congenital disorder characterized by macules of varying size and shape that are paler than the surrounding skin and cannot be made red by trauma, cold, or heat. [1] [2] The paler area is due to the blood vessels within the area which are more sensitive to the body’s normal vasoconstricting chemicals. [3]
Melanistic black eastern grey squirrel (Sciurus carolinensis) Melanistic guinea pigs (Cavia porcellus) are rare, and are used in rituals by Andean curanderos. [1] Melanism is the congenital excess of melanin in an organism resulting in dark pigment.
[2] [7] However, a 2022 study reveals that they might actually have had long gestation periods like placentals. [12] However, in 2024, all Allotheria (including multituberculates) fell outside the crown group of Mammalia, implying that cimolodonts developed placental-like gestation (and viviparity in general) independently, rather than ...
Melanin is also present in the inner ear, and is important for the early development of the auditory system. [2] Melanin is also found in parts of the brain and adrenal gland. [citation needed] The normal zebrafish embryo, above, shows the migration and maturation of melanocytes. The amelanistic embryo, below, has melanocytes but no melanin.
When iridophores are affected by axanthism, the animal typically becomes duller or darker in coloration due to a lesser amount of light reflected. [2] Typically it is only the skin that is affected, and the eyes still have iridophores. The opposite of axanthism is xanthochromism, which is an excess of yellow coloration.
Kansaignathus is a small-bodied dromaeosaur which was probably similar in size to Velociraptor.The authors of its description estimate that it was probably about 2 metres (6.6 ft) long, [2] which is similar to seize estimates for Velociraptor [5] and Dineobellator.
Xenosmilus is in the tribe Homotherini in the subfamily Machairodontinae of the cat family. [1] A paper published in 2022 proposed that Xenosmilus is a more derived member of the tribe Machairodontini (another name for Homotherini), and that Homotherium venezuelensis should be reassigned to Xenosmilus, [11] with a 2024 paper arguing that remains from Uruguay should also be assigned to the ...