Silly question for Americans

So I've never been there before I live in Australia but it's always fascinated me so I have some questions you might think is silly but I really wanted to ask. 
1: do you have to be careful in public specially at night from bears and cougars? 
2 we have places where you can buy American food, does America have that for Australian food?
3 do you guys have kangaroos in your zoos?
4 is a ranch a farm with horses?