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2015-10-28T09:18:04+05:30

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the two groups of animals are :- mammals and birds...
    i hope that this will help u.......................^_^
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2015-10-28T09:18:44+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
I think the answer is birds and mammals.These are the two groups of animals which burn fuel to generate body heat. Hope this helps you
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