here is something odd that happened to me 15 or so years ago.
a local creek, that I trapped in every year. the previous fall/spring, one location had no beaver, no sign of beaver, and another location less than mile upstream had a small colony where I had taken a couple and left them.
this is a small creek 10-15 feet wide, some deeper holes, most foot deep or lower.
that fall- the location with none, had seven dams stretching a block, and the other location had 3. and not check dams- dams that created deep pools.
I took 12 beaver at the 7 dam spot, and 7 at the other.
got them all out of 3 dam location early, no sign for months, took 11 out of 7 dam one, pinched an old male 2 times- we pulled all the dams, and that sucker was holed up in the last deep water hole ,would come out rarely. I'd see zero sign for day and weeks, finally think he moved on- and then a fresh twig, worked on him from DEC until late April- big storm so I had traps everywhere, and in the muddy deeper water got him in a 330.
got home, said thank God that job done- literally had trapping clothes in dryer to put away- landowner at the other location called.... he saw a beaver
good grief- so out we went, and when we got there we saw beaver swimming. so grabbed 3 330s, and started setting up- by the time I set the last, heard a commotion and had one in the 1st trap. so 4 months for one, 4 minutes for the other-
you got to laugh
got another the next day, and that was it
so 21 beaver out of less than mile on small creek where the fall before had been a couple at most.
I once saw a mass exit by beaver- a spot I found in fall, where it was beaver city with a half a doz pool dams, and a bunch of check dams- slides, fresh cuttings, I mean sign all over. that was late Oct. I went back in march- and like they had left the day after I was there. and I know for a fact it was not trapped.
so they had to go somewhere- and thats what must have happened for me that one year- cause BANG! beaver all over, adults, 2 year olds, kits
off subject- but anyone seen a squirrel migration? saw it once as a kid- back in my dads woods, part of a long ridge line of hardwoods- one day I was out and hundreds and hundreds of Grey squirrels were in and moving through the woods- never saw anything like it- every tree I could see was full of them-