What's invisible in the day but everywhere at night?

I prick the hand that grasps too fast, my name grows shorter when I’m cast from one to many; count me twice, I lose a letter, not my spikes. What am I?

I am five in binary and a laugh in slang. I am how many dogs there were in a well known movie with dogs

An island country, vast and grand, where marsupials hop across the sand. With coral wonders, ocean's embrace, it's a continent of a sunny place.

I grow on trees, but not a banana. Pairs with chocolate, and tasty with coffee, too.