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Equus originated in North America and direct paleogenomic sequencing of a 700,000-year-old middle Pleistocene horse metapodial bone from Canada implies a date of 4.07 million years ago (mya) for the most recent common ancestor of the equines within a range of 4.0 to 4.5 mya. [20]
There is a positive relationship between mass at birth and length of gestation in eutherian mammals. [17] Larger mammals are more likely to produce a well-developed neonate than small mammals.
Plains zebras are adapted for grazing on both long, tough grass stems and newly emerging short grass. In some areas, it rarely feeds below 100–150 mm (3.9–5.9 in) to ground level. It ranges more widely than many other species, even into woodlands , and it is often the first grazing species to appear in a well-vegetated area.
Adult mountain zebras have a head-and-body length of 2.1 to 2.6 m (6 ft 11 in to 8 ft 6 in) and a tail of 40 to 55 cm (16 to 22 in) long. Wither height ranges from 1.16 to 1.5 m (3 ft 10 in to 4 ft 11 in). They weigh from 204 to 372 kg (450 to 820 lb). [8] [1]
Zebras appear to be a monophyletic lineage [10] [11] [12] and recent (2013) phylogenies have placed Grévy's zebra in a sister taxon with the plains zebra. [10] In areas where Grévy's zebras are sympatric with plains zebras, the two may gather in same herds [13] and fertile hybrids do occur. [14]
A zebra that escaped from a trailer east of Seattle last weekend remained on the lam Friday, as authorities closed off trailheads at a nature area in hopes of keeping people away and easing her ...
The zebras were being transported from Washington to Montana when the driver took the Interstate 90 exit for North Bend, located about 30 miles (48 kilometers) southeast of Seattle, to secure the ...
Cape mountain zebra and young. Like all zebra species, the Cape mountain zebra has a characteristic black and white striping pattern on its pelage, unique to individuals. As with other mountain zebras, it is medium-sized, thinner with narrower hooves than the common plains zebra, and has a white belly like the Grévy's zebra.