|Brown quail (Coturnix ypsilophora)|
|Cladistically included but traditionally excluded taxa|
Old World quail are placed in the family Phasianidae, and New World quail are placed in the family Odontophoridae. The species of buttonquail are named for their superficial resemblance to quail, and form the family Turnicidae in the order Charadriiformes. The king quail, an Old World quail, often is sold in the pet trade, and within this trade is commonly, though mistakenly, referred to as a "button quail". Many of the common larger species are farm-raised for table food or egg consumption, and are hunted on game farms or in the wild, where they may be released to supplement the wild population, or extend into areas outside their natural range. In 2007, 40 million quail were produced in the U.S.
Quail that have fed on hemlock (e.g., during migration) may induce acute kidney injury due to accumulation of toxic substances from the hemlock in the meat; this problem is referred to as "coturnism".
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