How did Noah get all of the animals into the ark?

When God told Noah to build the ark, He also told him how many of what animal to bring on the ark as well.  However Noah did not have to go on an animal round up, but God brought the animals to him and more than likely caused them to go up into the ark.  It also needs to be remembered that animals were not afraid of humans until after the flood when God told Noah that He was going to put our dread upon the animals and that we could begin to eat them for food.  So it is reasonable that Noah could have gotten the different kinds of animals on the ark himself, but more likely that God influenced the animals to do so for him.