Mobs that appear randomly have specific spawn points. Wolves in the mountains spawn in specific spots. Greydwarves spawn in specific spots. Trolls spawn near troll caves or copper nodes. Golems spawn in specific spots usually near an abandoned mountain cabin or a silver vein.

Boars, deer, and birds also spawn in specific locations and once you find those spots deer and boars will respawn there every couple of in game days. Birds will respawn every couple in game hours.

There is also a bug in the spawn mechanic for deer and birds. If you have complete workbench coverage over a deer or bird spawn point they can occasionally spawn there anyway.
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