Ahhh – found the other muskrat den – in the NW corner, by the reed hutch, which seems to have been opened up by whatever. I found it by following a stream of water from the pond, which should not have been, into the bank – stuck my cane in, wiggled it about, and lo and behold – there was open space inside my pond bank, above the water level. I’ll get em, said the hopeful trapper. Sooner or later.