text:  Well, I think they rely upon the Earth's magnetic field for navigation. And that's how these dogs and cats will come a thousand miles home, you know. They take them away and they come back. That's not magic. And that's how the whales and dolphins travel, migrate thousands of miles north-south along the Pacific coast, you know. In fact, Dr. Kirschvink at UCLA, his hypothesis is that they travel in magnetic troughs.