Eat like a pig -when somebody got a bad table manners

He ate like pig and made whole dinning table messy

Eat like a bird- who eat doesn’t much

She eats like a bird.

Eat like a horse someone who eats a lot

The small dog really eats like a horse .

Eat a horse - some one is starving

I am so hungry , I could eat a horse

Drink like a fish - a person who drinks lot of alcoholic drinks

Jacks drinks like a fish