What does this Rebus Picture means ?

What does this mathematical rebus means ?

You walk into a room where there are three primates held in their respective cages:
1) A lion who is eating the flesh of a goat.
2) An orangutan who is playing with blocks.
3) A donkey who is sitting idle.

Who is the most intelligent primate in the room?

You can see it everyday, But cannot touch it at will. What is it?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

Find the missing letter in the last circle logically in the given below picture.

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?