Which alphabet letter is a question?

Can you find the hidden animal in the picture below?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

When is the top of a mountain similar to a savings account?

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

What is both possible and impossible at the same time?

The captain of a ship is telling you an interesting story and then poses a question. He says, “I have travelled the oceans far and wide. One time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. Can you tell me how that was possible?”

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?