FOUR RIDDLES

1. What can have two skins, one without and one within?
2. What did the detective in the Arctic say to the suspect?
3. A mother warned her daughter of the danger of sunbathing at the beach. When the girl returned home with a bad sunburn, what did her mother say?
4. How else can birds of a feather flock, if not together?

Answers:

1. A leather glove 
2. "Where were you on the night of September to March?" 
3. "You basked for it."
4. Answer unknown