What has higher energy output than a hummingbird?
December 17, 2012
I happened to be browsing Gerald L. Woods superb Guinness Book of Animal Facts and Feats (3rd edition) this morning, and happened across this fragment on page 76:
Not surprisingly, hummingbirds have the highest energy output per unit of weight of any living warm-blooded animal.
The wording struck me as strange: highest of any living warm-blooded animal? Is Wood just being redundant here, or is he implying that there are cold-blooded animals with a higher mass-specific metabolic rate? The idea seems inherently contradictory, doesn’t it?
I wondered whether he might have insect flight in mind?
Am I making a mistake in conflating “energy output” with “metabolic rate”?