Herons - my method is to shove an angled stick in so the top of the stick is about 2 feet above the surface of the water, and the end of the stick is just plumb over the far edge of the trap. Beaver will go under, and often even rear up to sniff the stick. After the ones that do that are done doing that, if they aren’t caught in the process, they typically proceed with working the set. Herons do not like to walk under anything that makes them duck (see what I did there??

) and will walk around the stick. So far this method has been 100% for me for about 5 years since I started doing it in spots that herons like to hang out. I have a whole folder on my computer of herons walking around the stick in this type setup and then later a beaver being caught. Even have one where a heron catches and eats a minnow then minutes later a beaver shows up and the heron leaves and the beaver is caught. Middle of the night too, herons can hunt fish at night apparently.
No non targets! It is a mantra in my business because I would not last long in my region if customers see collateral damage. Sometimes I pass on a location if I think the risk is too high. I think it is important to be able discuss techniques for avoiding non targets. But if that is not acceptable to the mods then hopefully they will delete anything out of line.