Heterotrophs
All animals are heterotrophs that derive energy from food. The (a) black bear is an omnivore, eating both plants and animals. The (b) heartworm Dirofilaria immitis is a parasite that derives energy from its hosts. It spends its larval stage in mosquitoes and its adult stage infesting the heart of dogs and other mammals.
Source
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"OpenStax College, Features of the Animal Kingdom. November 13, 2013."
http://cnx.org/content/m44655/latest/
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