Just a quick update for anyone who is also struggling with otters (or wants an excuse to post more puns):
We initially started with a radio (on 24 hours a day) and the animal motion detector. This worked for about two months, but then they returned. Moving the motion sensor (not necessarily closer to where they like to go, just for surprise) bought us another month. In the last month we turned off the radio and moved the motion sensor right where they like to go, and so far we've had no incursions.
I spoke with our pest control fellow. He said he knows a specialist and will do some research, but in general trapping doesn't work because the otter population is too large.
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