Two Men Charged Over Manchester Airport...
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No best answer has yet been selected by Trillipse. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.I don't think trees are all that energy efficient.
Looks like Antarctic sea Urchins are top contenders:
http://www.udel.edu/PR/experts/urchin.html
I do like the quote in the article:
So what does identifying the most energy-efficient animal mean to the rest of us, besides making us feel metabolically inadequate?