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Moderate grazing by cattle and other domesticated animals such as the Mexican burro is part of the traditional land-use in desert environments and has relatively little impact. But intensive grazing has severe effects because these animals favour the more palatable vegetation, and can allow the less palatable invasive "weedy" plants to proliferate. Moreover, the trampling caused by cattle can serious affect the regeneration of the larger cacti and succulents, some of which grow extremely slowly in their seedling stages (for example, see Saguaro).
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