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Examples of state-level diversity are that (1) only 18 of the 50 states automatically include in their own lists all animals and plants listed by the federal Act that are present in their state; (2) 17 states offer no protection for any plants; and (3) West Virginia and Wyoming have no statutory support for protecting even animals threatened ...
[30]: 416 This total is substantially more than the number of species protected in the United States under the Endangered Species Act. Bald eagle American bison. Ever since humankind began hunting to preserve itself, over-hunting and fishing have been a large and dangerous problem.
A threatened species is any species (including animals, plants and fungi) which is vulnerable to extinction in the near future. Species that are threatened are sometimes characterised by the population dynamics measure of critical depensation, a mathematical measure of biomass related to population growth rate.
2.50 m (8 ft 2 in) Jenny (1899 – February 1941), was a 20th-century female Asian elephant probably born in Ceylon . Jenny was exported to Germany , between 1915 and 1917 she was put into a work service in the Imperial German Army being one of the very few elephants serving in the Central Powers armies in World War I .
The brain of an elephant weighs 4.5–5.5 kg (10–12 lb) compared to 1.6 kg (4 lb) for a human brain. [77] It is the largest of all terrestrial mammals. [78] While the elephant brain is larger overall, it is proportionally smaller than the human brain. At birth, an elephant's brain already weighs 30–40% of its adult weight.
The dental formula of elephants is 1.0.3.3 0.0.3.3 × 2 = 26. [25] Elephants have four molars; each weighs about 5 kg (11 lb) and measures about 30 cm (12 in) long. As the front pair wears down and drops out in pieces, the back pair moves forward, and two new molars emerge in the back of the mouth.
[1]: 155 Secretions and urine collected from zoo elephants have been shown to contain elevated levels of various highly odorous ketones and aldehydes. [ citation needed ] Testosterone levels in an elephant in musth can be on average 60 times greater than in the same elephant at other times (in specific individuals these testosterone levels can ...
The Red List of 2012 was released 19 July 2012 at Rio+20 Earth Summit; [17] nearly 2,000 species were added, [18] with 4 species to the extinct list, 2 to the rediscovered list. [19] The IUCN assessed a total of 63,837 species which revealed 19,817 are threatened with extinction.