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Free-roaming mustangs (Utah, 2005). Horse behavior is best understood from the view that horses are prey animals with a well-developed fight-or-flight response.Their first reaction to a threat is often to flee, although sometimes they stand their ground and defend themselves or their offspring in cases where flight is untenable, such as when a foal would be threatened.
Extinct equids restored to scale. Left to right: Mesohippus, Neohipparion, Eohippus, Equus scotti and Hypohippus. Wild horses have been known since prehistory from central Asia to Europe, with domestic horses and other equids being distributed more widely in the Old World, but no horses or equids of any type were found in the New World when European explorers reached the Americas.
Horses are able to sleep both standing up and lying down. In an adaptation from life in the wild, horses are able to enter light sleep by using a "stay apparatus" in their legs, allowing them to doze without collapsing. [116] Horses sleep better when in groups because some animals will sleep while others stand guard to watch for predators.
In Siberia, annual temperatures fluctuate between +38 and −70 °C (100 and −94 °F) and winter may last for 8 months. [7] Yakutian horses are kept unstabled year-round, and in the roughly 800 years that they have been present in Siberia, they have evolved a range of remarkable morphologic, metabolic and physiologic adaptations to this harsh environment.
Wild horse Temporal range: earliest Middle Pleistocene -Recent 0.8–0 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓ Top left: Equus ferus caballus (horses) Top right: Equus ferus przewalskii (Przewalski's horse) Below left: Equus ferus ferus † (tarpan) Below right: Equus ferus fossil from 9100 BC Conservation status Endangered (IUCN 3.1) Scientific classification Domain: Eukaryota Kingdom ...
Icelandic horses weigh between 330 and 380 kilograms (730 and 840 lb) [2] and stand an average of 13 and 14 hands (52 and 56 inches, 132 and 142 cm) high, although the shortest measured Icelandic horse was 113cm (11.1hh), and the tallest measured 157cm (15.3hh).
Przewalski's horse (/(p) ʃ ə ˈ v ɑː l s k iː z, ˌ p ɜːr ʒ ə-/ (p)shə-VAHL-skeez, PUR-zhə-; [3] Russian: [prʐɨˈvalʲskʲɪj] (Пржевальский); Polish: [pʂɛˈvalskʲi]; Equus ferus przewalskii or Equus przewalskii [4]), also called the takhi (Mongolian: Тахь), [5] Mongolian wild horse or Dzungarian horse, is a rare and endangered horse originally native to the ...
The horse has a "visual streak", or an area within the retina, linear in shape, with a high concentration of ganglion cells (up to 6100 cells/mm 2 in the visual streak compared to the 150 and 200 cells/mm 2 in the peripheral area). [12] Horses have better acuity when the objects they are looking at fall in this region.