to Ghost's posts...

yes, you can have beasts) but not too many) I have enough in Heroes 4))) and you can strategically place them on the map (like in Disciples)), otherwise you'll end up with crocodiles in the snow)) haha
rats (large ones) on level 1 in the Dungeon... white tigers are better in the snow)), bears (both white and brown))), packs for the Necropolis, and also half-human, half-scorpions in the desert)) and that's enough... you don't need too many)
P.S. and only predators)) no elephants))