Everything falls theoretically the same speed, though air resistance slows down bulkier objects. This means a human would fall as fast as an elephant - because the gravity is the same acceleration; only difference is that the human would fall faster because air resistance has less space on the human to slow him down, whereas the Elephant is so huge that more air slows him down. This is also why cats can fall from 1-3 meters and could break a leg, but fall from 7-15 meters or so and land unharmed. They adjust themselves in such way that the air slows them down perfectly - allowing them a safe land. Though if the range is too far or too short of falling, then they don't have time to adjust and be slowed down by the air (falling from too low) or they accelerate too much that not even the air resistance could slow them down enough (falling from too high) and therefor could get harmed.
