Religion's pretty pervasive in humans. And why it's pervasive in humans is debated a lot. There are indications of things that look like religion in other animals, like chimps doing rain dances, and that sort of thing. Actually, I say that, but there's that and not much else.

But one thing that seems pretty clear when we look at human religion is that it's highly tied in with human culture. So if, as seems to be the case, culture's governing a lot of what whales do, it's perhaps not an unreasonable hypothesis to think that it's got elements of...what I guess you'd call the supernatural.

The real controversy comes with anthropologists - not all, but some - who see themselves as studying culture, and they then see culture from the perspective of humans, which is what they study. From their perspective, or, from some of their perspectives, it's sort of heresy to even talk about culture in any other animal. Others would say, "Yeah, you can talk about it, but our definitions of culture are so utterly different from yours and include things like values, and so on, which you've never shown to exist in any of these other creatures."

Studying the behavior of large whales has been likened to astronomy. The observer glimpses his subjects, often at long range; he cannot do experiments, and he must continually try to infer from data that are usually inadequate.

What I mean by it, and roughly what most biologists who talk about culture mean by it, is either behavior itself, or information that leads to behavior. Information that is picked up through social learning - so, from being with, watching, being taught by others. It's a way that individuals behave or get information about how they will behave that comes directly from the behavior of others.

What I mean is, if you look at the behavior of an animal and ask, "Well, why did it do that?" and then consider the alternatives, those alternatives probably wouldn't be as successful at getting its genes around.

A bunch of individuals do the same thing because they learned from watching each other or somebody else. That's what we would call culture.