Animal Automation

I think minecraft needs a way to automate collecting resources without spending dozens of hours on a redstone project ( this is if your a pro at redstone!). I propose that certain tamable mobs are added to collect resources. I think these mobs would have less of a chance of being tamed when fed since they are more useful then lets say a cat. Some examples are sea birds to collect fish, giraffes to collect sticks (branches) and apples, and monkeys to find random loot that you cant find. You would be able to set a perimeter to the area that they are collecting so they dont just roam endlessly.