Can you name an animal whose killing cannot be performed without spilling your own blood?

A bank customer had $100 in his account. He then made 6 withdrawals. He kept a record of these withdrawals, and the balance remaining in the account, as follows:

Withdrawals Balance left
$50 $50
$25 $25
$10 $15
$8 $7
$5 $2
$2 $0
----- -----
$100 $99

Why are the Totals not tallying?

Why do you find that most of the buildings are deprived of the 13th floor?

What has lots of eyes, but can’t see?

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?

Name a key which is hardest to turn.

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?

What is harder to catch the faster you run?

The peacock is a bird that does not lay eggs. How do they get baby peacocks?

There was a strange boy who was born before his father. How can this be possible?