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Grévy's zebra populations are estimated at less than 2,000 mature individuals, but they are stable. Mountain zebras number near 35,000 individuals and their population appears to be increasing. Plains zebra are estimated to number 150,000–250,000 with a decreasing population trend. Human intervention has fragmented zebra ranges and populations.
Its population was estimated to be 15,000 in the 1970s and by the early 21st century the population was lower than 3,500, a 75% decline. [ 28 ] : 11 In 2008, it was estimated that there are less than 2,500 Grévy's zebras still living in the wild, further declining to fewer than 2,000 mature individuals in 2016.
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]
The plains zebra was formally classified by British zoologist John Edward Gray in 1824 as Equus burchellii.After the quagga, described by Pieter Boddaert in 1785, was found to be the same species in the 21st century, the plains zebra was reclassified as Equus quagga due to the principle of priority. [5]
The human species has topped 8 billion, with longer lifespans offsetting fewer births, but world population growth continues a long-term trend of slowing down, the U.S. Census Bureau said Thursday.
The United States population grew by 3.3 million people this year, the largest increase in more than two decades that was primarily driven by immigration, according to data released this week by ...
The mountain zebra (Equus zebra) is a zebra species in the family Equidae, ... In the 1930s, their population was reduced to about 100 individuals. However ...
As the aging population increases, so will centenarians. According to a 2024 Pew Research Center report, the number of Americans aged 100 or over is likely to quadruple by 2054 as baby boomers, ...