Riddle #456

Question: I am a big threat to humanity,
but you wouldn't get rid of me even if you could.

What am I?

Question: What do you call a sad bird?

Question: What tastes better than it smells?

Question: What goes in the water black and comes out red?

Question: What loses its head in the morning and gets it back at night?

Question: What two things can you never eat for breakfast?