大象传媒

San Diego. We're definitely in the United States of America now. Look at that development. There isn't a part of that coastline that hasn't got a building on it. There's so much traffic here, there's so much noise. Who knows what the whales think when they reach this spot. This is our whales' first major contact with the world of man since leaving the lagoons, and it's a rude awakening - boy are we a noisy bunch. Like other whales, sound is a key sense for the greys and all this din must be very confusing - even dangerous. Calves could get separated from their mothers by boat traffic, so more experienced mums may guide their calves offshore, away from the noise of the city.