Electron microscope observations? Echograms? What's the most exotic imaging tech you've seen in an observation?

Nature Talk
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I was just wondering.

We talk a lot about exotic species and locations, but what are the exotic observation technologies that have been used in iNat postings?

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I think I heard of someone using a light sensitive chemical emulsion to capture images of organisms.

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Maybe not the most exotic, but thermal imaging is certainly interesting.

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Well there’s @joemdo that frequently uses spectrograms for bat observations in my area, but other than that I haven’t really seen too many exotic observation methods.