Misc: what are the roads of guam paved with?

Questions

Which year did Niagara Falls freeze?

Name the two species that cannot walk backwards?

Where does the kangaroo’s tail have to be situated in order for it to jump?

What is the only animal which can chew in a figure 8 pattern?

Thinking that its parents were a camel and a leopard, the Europeans once called the animal a ‘cameleopard’ Today it’s called?