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

What has no start, end, or centre?

What has hands, but can’t clap?

Buy me, smell me or deliver me, I do not change.

Who am I?

I have branches, but no fruit, trunk or leaves. What am I?

If two's company, and three's a crowd, then whats four and five ?

When can we add 2 to 11 and get 1 as the correct answer?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

What part of Turkey has the most feathers?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.