How tall are zebra?
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The Grévy's zebra is the largest of all wild equines. It is from head to tail with a tail, and stands high at the withers. These zebras weigh . Grévy's zebra differs from the other two zebras in its more primitive characteristics. It is particularly mule-like in appearance; the head is large, long, and narrow with elongated nostril openings; the ears are very large, rounded, and conical and the neck is short but thick. The zebra's muzzle is ash-grey to black in colour with the lips having whiskers. The mane is tall and erect; juveniles have a mane that extends to the length of the back and shortens as they reach adulthood.
Grévy's zebra
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The Cape mountain zebra differs slightly from the Hartmann's subspecies, being stockier and having longer ears and a larger dewlap. Adults have a shoulder height of 116 to 128  cm, making them the most lightly built subspecies of zebra. There is slight sexual dimorphism with mares having a mass of around 234  kg and stallions weighing around 250–260  kg.
Cape mountain zebra
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Zebra duikers have gold or red-brown coats with 12-16 distinctive zebra-like stripes, dark markings on their upper legs, and russet faces. Newborns appear darker because they are born with their stripes closer together. An adult can grow to in length, 45 cm in height, and in weight. Their horns are short and round with sharp pointed tips. They are about 4.5 - 5.0 cm long in males, and half that in females. Female body size is larger than males, possibly due to long gestation periods.
Zebra duiker
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This northern subspecies is vertically striped in front, horizontally on the back legs, and diagonally on the rump and hind flanks. Shadow stripes are absent or only poorly expressed. The stripes, as well as the inner spaces, are broad and well defined. Northerly specimens may lack a mane. Grant’s zebras grow to be about tall, and generally weigh about . The zebras live in family groups of up to 18 zebras, and they are led by a single stallion. Grant’s zebras typically live 20 years.
Grant's zebra
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It was installed in 1977 by artist Jaap Karman. It stands 8 meters tall, it has three matching sides with moulded plastic faces of black and white stripes indicating the position of the hours, and is internally lit. It has been destroyed by fire and restored twice - a few months after installation and again in 1985. The clock was temporarily removed from 1997 to 2002, and again from 2008 to 2011 for renovations to the square and station precinct.
Zebra clock
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The vast majority of the organisms that are natural enemies in Europe are not present in North America. Ecologically similar species do exist, but these species are unlikely to be able to eliminate those mussels already established and will have a limited role in their control.
Crayfish could have a significant impact on the densities of 1- to 5-mm-long zebra mussels. An adult crayfish consumes around 105 zebra mussels every day, or about 6000 mussels in a season. Predation rates are significantly reduced at lower water temperatures.
Fish do not seem to limit the densities of zebra mussels in European lakes. Smallmouth bass are a predator in the zebra mussels' adopted North American Great Lakes habitat.
Zebra mussel
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Amoria zebra, common name the zebra volute, is a species of sea snail, a marine gastropod mollusk in the family Volutidae, the volutes.The length of the shell varies between 25 mm and 55 mm. These shells are solid, glazed, with a short spire. Whorls are usually smooth and glossy. 
Columella is white and shows four strong plaits. The outer lip is thickened and smooth. The pattern of these shells is quite variable, in colour and in the density of the axial lines. The background colour varies from white to fawn or mid-brown, usually with axial brown lines.
Amoria zebra
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Zebra mussel and the closely related and ecologically similar quagga mussels are filter-feeding organisms. They remove particles from the water column. The zebra mussels process up to one liter of water per day, per mussel. Some particles are consumed as food, and feces are deposited on the lake floor. Nonfood particles are combined with mucus and other matter and deposited on lake floors as pseudofeces. Since the zebra mussel has become established in Lake Erie, water clarity has increased from 6 inches to up to three feet in some areas. This improved water clarity allows sunlight to penetrate deeper, enabling growth of submerged macrophytes. These plants, when decaying, wash up on shorelines, fouling beaches and cause water quality problems.
Zebra mussel
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This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-NH group of donors with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is N6-(L-1,3-dicarboxypropyl)-L-lysine:NAD+ oxidoreductase (L-lysine-forming). Other names in common use include lysine-2-oxoglutarate reductase, dehydrogenase, saccharopine (nicotinamide adenine dinucleotide, lysine forming), epsilon-N-(L-glutaryl-2)-L-lysine:NAD oxidoreductase (L-lysine, forming), N6-(glutar-2-yl)-L-lysine:NAD oxidoreductase (L-lysine-forming), 6-N-(L-1,3-dicarboxypropyl)-L-lysine:NAD+ oxidoreductase, and (L-lysine-forming). This enzyme participates in lysine biosynthesis and lysine degradation.
Saccharopine dehydrogenase (NAD+, L-lysine-forming)
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The Grévy's zebra ("Equus grevyi"), also known as the imperial zebra, is the largest living wild equid and the largest and most threatened of the three species of zebra, the other two being the plains zebra and the mountain zebra. Named after Jules Grévy, it is the sole extant member of the subgenus "Dolichohippus". Grévy's zebra is found in Kenya and Ethiopia. Compared with other zebras, it is tall, has large ears, and its stripes are narrower.
Grévy's zebra