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I get almost daily human traffic from Qwant
194.187.171.33 - - [01/Aug/2015:11:44:18 -0700] "GET /favicon.ico HTTP/1.1" 200 606 "https://www.qwant.com/?q={plausible-query-here}" "Qwantify/1.0"
It wasn't always the favicon, but always an image file, generally with a qwant.com referer to go with the stripped-down UA and legitimate IP. No immediately adjacent requests that would make the image fetch part of some complete human visit. Do a search and you'll see that favicons are being used as site markers in the SERP.