Pretty much what the title says. I've looked for tutorials on this but I've only found how to make new entities but not on how to replace the vanilla mobs (creepers, cows, pigs, etc). I'm not currently interested on making custom animations for them, just replace the vanilla model.
I currently don't have much issues creating models on blockbench but replacing bedrock mobs just escapes my grasp, any help on this would be greatly appreciated.