<p><b>Adult Male Raggiana Bird of Paradise (<i><a href="//commons.wikimedia.org/wiki/Paradisaea_raggiana" title="Paradisaea raggiana">Paradisaea raggiana</a></i>).</b>
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Body size, altitude, and diet account for 99.0% of the variation in the metabolic rates of birds of paradise.
(Photo: Brian McNab)
CC BY 2.5
Whitfield J: <i>Ecology's Big, Hot Idea.</i> PLoS Biol 2/12/2004: e440. <a href="//doi.org/10.1371/journal.pbio.0020440" class="extiw" title="doi:10.1371/journal.pbio.0020440">doi:10.1371/journal.pbio.0020440</a>