The temperature range in these images (and others on the site) mean that these were taken with a thermal imaging camera; 300-310K blackbody spectra peak somewhere between 9 – 10 microns, rather than a regular ol’ digital camera with the IR filter disabled.
Frankly, though, most of the other birds and mammals in the menagerie have more interesting IR spectra associated with them, like yappy dog.
A lot of the radiation from the swan’s neck/head can be attributed to the colour, as well as the density of the feathers.
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