What Goes Up

I am brown. I have a mane.

I like to eat zebras. I roar.

Who I am?

What comes once in a minute, twice in a moment, but never in a thousand.

What am I?

What goes up and never comes down?

I am big and blue. I am a Mammal.

I live in the ocean. I can swim.

Who I am?

I am made of milk. You keep me in the fridge.

I am cold and you like to eat me in the summer.

Who am I?