"why, we have been there before," they answered; "and we can see the places over which we pass. but perhaps that is not the real reason, for sometimes we fly over such great stretches of water that we can see nothing else and it all looks alike. then we cannot see which way to go, but still we feel that we are drawn south, and we only have to think about that and fly onward. the fathers and sons can fly the faster and will reach there first. the mothers and daughters come a few days later.