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The miniature chameleon Brookesia nana, with a snout-vent length of 13.5 mm (0.53 in), may represent the smallest known lizard and smallest reptile. [49] [50] The dwarf gecko (Sphaerodactylus ariasae) is also one of the smallest known reptile species, with a snout-vent length of 16 millimetres (0.63 in). [51]
While "least concern" is not considered a red listed category by the IUCN, the 2006 IUCN Red List still assigns the category to 15,636 taxa. The number of animal species listed in this category totals 14,033 (which includes several undescribed species such as a frog from the genus Philautus [2]). There are also 101 animal subspecies listed and ...
More than 99 percent of all species, amounting to over five billion species, [7] that ever lived on Earth are estimated to be extinct. [8] [9] Estimates on the number of Earth's current species range from 10 million to 14 million, [10] of which about 1.2 million have been documented and over 86 percent have not yet been described. [11]
Utatsusaurus is the earliest-known ichthyopterygian. Plateosaurus engelhardti Cycas circinalis For about 150 million years, dinosaurs were the dominant land animals on Earth. From 251.9 Ma to 66 Ma and containing the Triassic, Jurassic and Cretaceous periods.
Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million in total. Animals range in size from 8.5 millionths of a metre to 33.6 metres (110 ft) long and have complex interactions with each other and their environments, forming intricate food webs.
As of July 2021, the IUCN lists 14,033 animal species and 6,635 plant species as least concern. [1] No least concern assessments have been made for taxa of other kingdoms. Lists: Animals (kingdom Animalia) Amphibians — List of least concern amphibians; Birds — List of least concern birds; Fish — List of least concern fishes
The Etruscan shrew (Suncus etruscus), also known as the Etruscan pygmy shrew, white-toothed pygmy shrew and Savi’s pygmy shrew, is the smallest known extant mammal by mass, weighing only about 1.8 g (0.063 oz) on average.
Rare species are species with small populations. Many will move into the endangered or vulnerable category if the negative factors affecting them continue to operate. Well-known examples of rare species - because these are large terrestrial animals - include the Himalayan brown bear, Fennec fox, Wild Asiatic buffalo, or the Hornbill.