the mother and calf we see arriving in alaska is not the same animals that we saw leaving in hawaii. >> reporter: reason? they had no means or money for tracking two whales at ocean depths for 3,000 miles. still, it feels good that misty and echo or whoever they are finally make iter or seem to. can we not care about the animals if we don't give them human names? >> it is easier to care about animals if you give them names. and this is a big debate in science. jane goodall named her chimps and she was criticized for that. but look at the incredible good that she's done. >> reporter: and that's the other side of the argument. the fake stuff, and it's usually only a fraction of any movie, it helps us to care, inspiring awe, even love. putting us on the side of the animals, which is why he makes films himself. so, in his movie "bears," yes, it's true, not all the animals are wild -- they got there that day by truck, essentially. >> yeah, yes. >> reporter: and it's true there was a trainer offscreen in this scene telling the animals what to do. >> they are trained through being fed, rewa