When you're small and vulnerable, like these starlings, or like the fish, it helps to swarm to avoid predators, to confuse predators.

They have sex. They hide from predators.

New predators, hyenas, getting faster and faster still.

Well, it uses it to defend itself from its predators.

Like a lot of predators, they walk on their toes.

So how are these fish, these predators going to help?

And they go in the base of that pyramid, and they drift up they're passed up that way, on to predators and on to the top predators, and in so doing, they accumulate.

They could outsource all their problems protection from predators, food finding, health maintenance.

They use it for finding food, for attracting mates, for defending against predators.

The good news is that, in addition to having more predators, there's more of everything.

It was presumably introduced into Guam via military cargo and has no natural predators in Guam.

The effect, the payback, perhaps, for years of vampire predators like Bernie Madoff, whom we saw earlier.

As I say, it's just those three simple rules, plus the one about watch out for predators.

Here's an octopus. Sometimes they don't want to be seen when they move because predators can see them.

We've heard about the Tagging of Pacific Predators project, one of the 17 Census of Marine Life projects.

First of all, your pyramid, your inverted pyramid, showing 85 percent biomass in the predators, that seems impossible.

So what we can see on this moving ocean is we can finally see where the predators are.

But what of those big predators, those fashionable species, that green list tuna that I was talking about earlier?

They have been rarely photographed, partly because they are considered one of the most dangerous predators in the ocean.

In Latin America, the number of countries with specific legislation to punish sexual predators who target children increased to nine.

But that's due to natural predators like vultures that pick them off on a beach or predatory fish that are waiting offshore.

Now, the main defense against pack hunting predators is to get into herds, and the larger the herd, the safer the individuals.

'Strong predation on a massive, heavily armored dinosaur illustrates just how dangerous the dinosaur predators of the Cretaceous must have been,' said Brown.

So the default position is just Believe all patterns are real All rustles in the grass are dangerous predators and not just the wind.

This is from a BBC show called Predators, and what we're looking at here are examples of synchrony that have to do with defense.

When it moved into its new host, the Eastern Hemlock tree, it escaped its predators, and the new tree had no resistance to it.

We have no significant predators, we're the masters of our physical environment the things that normally cause species to become extinct are no longer any threat to us.

If we're going to save the world from total jellyfish domination, then we've got to figure out what the jellyfish predators how they live their lives, like the Mola.

It actually uses the light from the bacteria to counter illuminate itself in an anti predation device so predators can't see its shadow, calculate its trajectory, and eat it.

So he got rid of the electricity, he got rid of current on the inside and kept it on the outside, so it would protect them against coyotes and other predators.

The heavily armoured dinosaur used red and white camouflage to hide from predators, and employed a shielding technique known as counter shading, which is also used by many modern day animals.

If you stop a cat from playing which you can do, and we've all seen how cats bat around stuff they're just as good predators as they would be if they hadn't played.

There's a good reason why the shallow water's full of predators here's a barracuda and if you're an octopus or a cephalopod, you need to really understand how to use your surroundings to hide.

So now we had a system that we could actually take to some place that was kind of like an oasis on the bottom of the ocean that might be patrolled by large predators.

Plants behave in some oddly intelligent ways fighting predators, maximizing food opportunities ... But can we think of them as actually having a form of intelligence of their own? Italian botanist Stefano Mancuso presents intriguing evidence.

But a growing body of research concludes that greed is not always good, and that moral values are a necessary element in the conduct of business. The Gordon Gekkos are predators who take the quick payoff.

And, funded primarily through Sloan Foundation and others, we were able to actually go in, in our project we're one of 17 field programs and begin to take on tagging large numbers of predators, not just tunas.

What we had failed to understand was that these seasonal humidity environments of the world, the soil and the vegetation developed with very large numbers of grazing animals, and that these grazing animals developed with ferocious pack hunting predators.

What I find so exciting is that the Census of Marine Life has looked at more than the tagging of pacific predators it's also looked in the really unexplored mid water column, where creatures like this flying sea cucumber have been found.

Well, for animals that are trying to avoid predators by staying in the darkness, light can still be very useful for the three basic things that animals have to do to survive and that's find food, attract a mate and avoid being eaten.

There is only one option, I'll repeat to you, only one option left to climatologists and scientists, and that is to do the unthinkable, and to use livestock, bunched and moving, as a proxy for former herds and predators, and mimic nature.

Tuna are ocean athletes fast, far ranging predators whose habits we're just beginning to understand. Marine biologist Barbara Block fits tuna with tracking tags that record unprecedented amounts of data about these gorgeous, threatened fish and the ocean habitats they move through.

When our ancestors moved out of the African forest onto the savannah more than a million years ago, they rapidly became effective predators. Sharing prey with pre existing carnivores, they acquired tapeworms that originally inhabited only hyenas, large cats, and African hunting dogs.

As a result, competitive displays have been interpreted as a way to demonstrate fitness to a potential mate. A bird that survives, despite inconvenient plumage that slows it down or makes it visible to predators, must be fit, and will likely sire a healthy progeny.

But humans are social creatures with no natural predators, so female competition is more widespread and demonstrative performance and display are more likely. Indeed, while visual manifestations of wealth are prevalent for both genders, women s appearance is frequently more vivid (and more closely scrutinized).