Livestock in Afghanistan mainly include cattle, sheep, and goats. Building and using modern poultry farms is also a fast-growing industry. The availability of land suitable for grazing has traditionally made animal husbandry an important part of the economy. There are two main types of animal husbandry: sedentary, practiced by farmers who raise both animals and crops; and nomadic, practiced by animal herders known as Kochis. Natural pastures cover some but are being overgrazed. The northern regions around Mazar-i-Sharif and Maymana were the home range for about six million karakul sheep in the late 1990s. Most flocks move to the highlands in the summer to pastures in the north.