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CCC comments on The Octopus, the Dolphin and Us: a Great Filter tale - Less Wrong
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You still have to get rid of waste heat, you can't recycle it because of the second law of thermodynamics. So they'd radiate highly in the infrared.
Incidentally, there is an object in the Triangulum galaxy that's dim in the visible and near-infrared but the most luminous thing in that galaxy in the mid-infrared.
Waste heat. Sorry, my internal editor cringes at that...
As to the object, I notice something interesting. In the writeup:
And then I look at the paper - and it was submitted in December 2010, only a few years ago. Which then leads to the question - has anyone looked for things that are dim in near-infrared but bright in far-infrared? Do we actually know how much apparent dark matter is (or isn't) pumping out waste heat all over the place?
(That is a very interesting page, by the way...)