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One in three animal parasites, one of the most threatened groups of life on Earth, may face extinction by 2070, as a result of global climate change, a study has warned. The study determined that parasites are even more threatened than the animal hosts they rely on and thus should be included in conversations about conservation. Loss of parasite, which help control wildlife numbers and keep energy flowing through food chains, could dramatically disrupt ecosystems. On the other hand, having parasites indicates that the ecosystem has been stable.