Sort:  

Raven is black as well as ink in inkpot on the desk.

Also a great answer.

Because a feather could be found on both.

I am gonna count it.

Lewis Carroll's own suggested answer to this question (which he originally wrote without any sensical answer intended) was "Because it can produce a few notes, though they are very flat; and it is never put with the wrong end in front", which is a very clever answer indeed.