I know they're a bit bigger, but all my cars have a resident engineer, (aka spider) never remove the engineer, not only might the item break, but flies will survive!
I had a tiny spider in the viewfinder of my 1D4 - it was quite fun watching him wander about from time to time then he stopped coming back. I do wonder if the sensor cleaner got it or perhaps he migrated to a Nikon, I miss the little fella!
7DII+Grip, 7D+Grip, 40D+Grip, 5D+Grip, EF 24-105 f4L EF-S 17-85, EF-S 10-22, EF 70-200 f2.8 L IS II, EF 2x III, EF 100-400 f/4.5-5.6l IS II, Σ17-70 f2.8-4 C, EF 50mm f1.8, 550EX, Triopo TR-985, Filters Remotes Macro tubes Tripod heads etc!
5D, 20D, 24-105, BG-E4, BG-E2N, 17-85, Nifty 50 pre owned.