Which is heavier: a ton of bricks or a ton of feathers?

I always drive my customer away.

Who am I?

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?

When we see 2 but call 10?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

An octopus has 8 legs. A hippogriff has 6 legs and 2 pairs of wings. A sphinx has 6 legs and one pair of wings. Now we have all 3 kinds and a total of 18 insects in a cage. We have a total of 118 legs and 20 pairs of wings. How many insects do we have of each kind?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?