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In page Overgrazing:

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In New Zealand, overgrazing is a massive threat to the native species of flora and fauna, especially the native bushes which are often overlooked by invasive species looking for homes.[citation needed] Mustalids, rabbits, hares and possums often eat the plants that hold soil together. This makes the ground very unstable and crumbly. If soil is unstable, it is prone to collapse in extreme weather events such as floods and heavy rain. This is detrimental to farmers of crops and animals alike. 40% of the native species of New Zealand have been wiped out by pests including humans.[citation needed]