Are there animals (or plants) that are parasitic on both animals and plants?
Especially such that they rely on their plant host being eaten by their animal host?
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haven't heard of a plant/animal like that... there are micro-organisms that wait to be ingested by animals to continue their life cycle though – The Last Word Feb 25 '15 at 04:49
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My guess is that fungi would be the best candidate, without knowing about a particular answer/example to your question. I know that there are groups of parasitic fungi that have switched between animal and plant hosts (i.e. in relation to speciation events, not host switching/complex life cycles within the same species of fungi). – fileunderwater Feb 25 '15 at 12:54
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Plant to animal switching is known in e.g. rust fungi (from Pucciniomycetes), where you can also find complex life cycles with intermediate hosts (a Heteroecious life cycle). – fileunderwater Feb 25 '15 at 13:09