It is a Root Vegetable

I am a desert animal. I am tall.

People like to ride on me. 

Who I am?

I hiss. I can be poisonous.

I am long. I have a forked tongue.

Who I am?

I am the fourth planet from the sun.

I am also called as the red planet.

Who am I?

I am small and brown. I eat nuts.

I can climb trees. I have a nice tail.

Who am I?

I can swim. I can't fly.

I eat fish. I am a bird.

Who I am?