I am a Sweet Fruit

I live in Africa. I am Yellow and Brown.

I eat leaves. I have a long neck.

Who I am?

I am the eighth planet from the Sun. My twin brother is Uranus.

I am the farthest planet from the Sun.

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?