This mod will add to the game really a lot of new mobs that are very different from each other. Some animals will be in the air, some on land and others under water.
Alexs Mob (more mobs) for Minecraft 1.16.4
In any case, now the Minecraft world will become much more alive and varied, especially with regard to mobs. You should be extremely careful when entering the water because now crocodiles and killer whales are swimming there. Birds and flies will appear in the air. Roe deer and some other mobs will be added on land.
Download Link: Alexs-Mob-Mod-1.16.4