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Like other hartebeests, the bubal was a social animal. Luis del Mármol Carvajal wrote in 1573 that herds of 100 to 200 animals could be found in northern Morocco. According to 19th century writers, the bubal hartebeest preferred rocky areas with a fair amount of vegetation, in contrast to the sandy, drier habitat of the Addax.
A large antelope with a particularly elongated forehead and oddly shaped horns, the hartebeest stands just over 1 m (3 ft 3 in) at the shoulder, and has a typical head-and-body length of 200 to 250 cm (79 to 98 in). The weight ranges from 100 to 200 kg (220 to 440 lb). The tail, 40 to 60 cm (16 to 24 in) long, ends in a black tuft. [40]
The bluebuck (Afrikaans: bloubok / ˈ b l aʊ b ɒ k /) or blue antelope (Hippotragus leucophaeus) is an extinct species of antelope that lived in South Africa until around 1800. It was smaller than the other two species in its genus Hippotragus , the roan antelope and sable antelope .
However, many of the causes of amphibian declines are still poorly understood, and the topic is currently a subject of ongoing research. Modeling results found that the current extinction rate of amphibians could be 211 times greater than the background extinction rate. This estimate even goes up to 25,000–45,000 times if endangered species ...
The main cause of habitat degradation worldwide is agriculture, with urban sprawl, logging, mining and some fishing practices close behind. [29] Disease can also be a factor: white nose syndrome in bats, for example, is causing a substantial decline in their populations and may even lead to the extinction of a species. [30]
The Permian–Triassic extinction event saw the greatest level of insect extinction, and the Cretaceous–Paleogene the second highest. Insect diversity has recovered after mass extinctions, as a result of periods in which new species originate with increased frequency, although the recovery can take millions of years.
The subfamily Alcelaphinae (or tribe Alcelaphini), [1] [2] of the family Bovidae, contains the wildebeest, tsessebe, topi, hartebeest, blesbok and bontebok, and several other related species.
The event may put a species at risk of extinction or upset an ecosystem. [2] This is distinct from the mass die-off associated with short lived and synchronous emergent insect taxa which is a regular and non-catastrophic occurrence. [3] Causes of MME's include disease and human-related activities such as pollution.