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...ed on observation of diverse species, such as chickens, sheep, [[butterfly|butterflies]], and [[chimpanzee]]s. The habit of changing diet has been shown to be a p ...

...ed on observation of diverse species, such as chickens, sheep, [[butterfly|butterflies]], and [[chimpanzee]]s. The habit of changing diet has been shown to be a p ...

...: some animals such as non-human [[primate]]s, [[Monarch butterfly|monarch butterflies]] and [[sheep]] ingest medicinal plants when they are ill.<ref>{{cite book ...

...public issue after a 1999 paper suggested they could be toxic to [[monarch butterflies]]. Follow up studies have since shown that the toxicity levels encountered ...