Jokes and riddles

Click the green buttons to view the answers... but only if you're stuck! :)
WHAT?
What is small and grey, sucks blood and eats cheese?
What is the biggest ant in the world?
What game do cannibals play?
WHY?
Why is the letter "t" important to a stick insect?
Why did the orange go to the doctor's?
Why does Henry keep his clothes in the fridge?
Why do birds fly south?
WHICH?
Which bee is good for your health?
Which American president wore the largest hat?
Which question is never answered with "yes"?
WHERE?
Where do ants eat?
WHEN?
When do owlets go to parties?
When is it unlucky to see a black cat?
HOW?
How can you fit four elephants in a sports car?
How do you greet a monster with three heads?
How do you count cows?