Why do some ants bite?

For some ants, even if they bite we wouldn't know because of the low concentration of formic acid in their glands. Whereas some other species of ants when they bite it really turns painful or fatal. There is a species of ant called bullet ants the sting of which is often compared to a bullet shot. read more

Actually, its not what it seems like. Ants do not bite humans so as to attack them. Ants bite humans only for their defense. When any individual ant feels that you might be a possible threat to them or their colonies, then they become aggressive and try to defend. read more