Do animal spawn locations change?

[TamTroll]

On year 2 of my world. for the 1st year there were next to no hostile animal spawns in my area. There was a valley with wolves, and a mountain with bears, and a big chunk of area where the only predators were Foxes and Raccoons that didn't cause trouble.

Now though, I've noticed there's a chunk of forest right next to my base that used to be clear of predator spawns, but has recently started spawning a bear every so often, recently i neglected to check on it, and it killed my Bighorn Ewe.

What changed here? Do animal spawn locations change every year, or would this have been a previous update changing spawn locations? This forest is right next to my territory, so not a huge fan of always having a bear spawning in there to hunt my sheep.