For a week, I “mirrored” the contents of 24 nest poles in the Great Island osprey colony. I use a light convex bicycle mirror on the end of a long, curved bamboo wand. Standing on the salt marsh below a 12-foot-high nest platform, with my arms raised, I could check the progress of each nest.
It would be hard to proclaim which plant wins as the worst terrestrial invasive species in the US, but Japanese Knotweed, Polygonum cuspidatum, is a clear contender.