Quercus spp. is toxic to horses. The reported severity is critical. Also known as Oaks, High-Latitude Oaks and White Oaks.
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Abdominal Pain Diarrhea Depression Increased Urination Blood In Urine Jaundice Intestinal Obstruction Liver Failure
The color of each symptom follows the severity scale above.
An oak is a hardwood tree or shrub in the genus Quercus of the beech family. They have spirally arranged leaves, often with lobed edges, and a nut called an acorn, borne within a cup. The genus is widely distributed in the Northern Hemisphere, with some 500 species, both deciduous and evergreen. Fossil oaks date back to the Middle Eocene. Molecular phylogeny shows that the genus is divided into Old World and New World clades, but many oak species hybridise freely, making the genus's history difficult to resolve.
The leaves and acorns of oaks are poisonous to livestock, including cattle and horses, if eaten in large amounts, due to the toxin tannic acid, which causes kidney damage and gastroenteritis. An exception is the domestic pig, which, under the right conditions, may be fed entirely on acorns, and has traditionally been pastured in oak woodlands (such as the Spanish dehesa and the English system of pannage). Humans can eat acorns after leaching out the tannins in water.
Also recorded as Acorn, Oak and Oak Tree.
More plants with critical severity:
Countries with the most wild observations, from GBIF data.