Terminal Velocity is a phrase used to describe the maximum constant speed that a falling object can reach before it cannot accelerate any further. This happens when the air resistance pushing the object up becomes equal to the force of gravity pulling the object down. The terminal velocity of a human being is 120mph, as such, should you manage to reach this speed while falling and hit the ground you would most likely end up in a bad way.
However, an ant is so light that should you choose to throw one off the top of a skyscraper and it reached its terminal velocity, it would only be travelling at 3.9mph, due to its size and weight the air resistance acting against the ant is so strong that gravity cannot physically pull it down to earth any faster. Due to the slow speed and the ant’s strong exoskeleton which braces it for impact, they do not suffer any damage from falling at any height and the impact would have been the same as if it had fallen a few centimetres.