Which of the below owl is odd one out?

Replace the question mark with the number below given a simple math problem.

Can you find the six hidden animals in the picture below?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

Why is the longest human nose just 11 inches?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

Two friends decide to get together; so they start riding bikes towards each other. They plan to meet halfway. Each is riding at 6 MPH. They live 36 miles apart. One of them has a pet carrier pigeon and it starts flying the instant the friends start traveling. The pigeon flies back and forth at 18 MPH between the 2 friends until the friends meet.

How many miles does the pigeon travel?

What does the below rebus riddle means?