Misc: What constellation is represented by a crab?

Questions

Ogdensburg, New York is the only city in the United States situated what river?

Gilligan of Gilligan's Island had a first name that was only used once, on the never-aired pilot show. His first name was?

In England, the Speaker of the House is not allowed to?

What color do turnips turn when sunburnt?

A flamingo can eat only when its head is?