Because there's nothing for them to drop currently besides wool.
Sheep are there to provide wool to mafe for example a bed. Pigs are a source of food
You kill cows for it, and they either drop food, or leather. You can't make leather out of anything else, you have to get it.
I Think they are consumers because I don't think they make their own food I dont think sheeps are like plants and make they own food but remember this is just what I think
Sheep are a food source for tigers ie tigers will eat sheep
well they dont have a special name when they are born till about almost a year they are called lambs
There are hundreds of sheep killed each year for food. The exact number of sheep killed varies from country to country.
With its Mouth...
in the grass
By grazing
no
Carry the food and then right click.
Pork Chops, which can be eaten for food, they also drop experience. If you kill it with a enchanted sword with fire aspect, or a bow with flame, you will get cooked porkchops with experience.