Romantic love enables you to focus your mating energy on just one at a time, conserve your mating energy, and start the mating process with this single individual.

A mating of eagles, Your Sanctity!

Because the chimps have a very promiscuous mating society.

And, unfortunately, on YouTube, there's many cats mating videos.

I think romantic love evolved to enable you to focus your mating energy on just one individual at a time, thereby conserving mating time and energy.

I think romantic love evolved to enable you to focus your mating energy on just one individual at a time, thereby conserving mating time and energy.

In this case, life's greatest prize an appropriate mating partner.

So we go online, and we put in cats mating.

We're getting the results of the mating season about now.

Tool use must have enhanced our survival, mating and so on.

The only cost in most flocks is a loss of free mating.

No, the peacock's tail results from the mating choices made by peahens.

That is, to send more winged queens and males to that year's mating flight.

The first documented, successful vertebrate reproduction in space involved mating and hatching Medaka fish eggs.

The glowworm shows the mating to be near and 'gins to pale his uneffectual fire.

On the bottom tier we have basic needs shelter, clothing, food, water, mating and so forth.

Foremost, I have come to think that romantic love is a drive, a basic mating drive.

So we put in dogs mating, and, you know, we're watching it, and she's totally absorbed.

And then she goes, Mom, do you think they would have, on the Internet, any humans mating?

And she's in the process of mating with this male, and there's another male on top waiting his turn.

And they will live for 15 or 20 years, continuing to lay eggs using the sperm from that original mating.

And they do that by each year sending out the reproductives those are the ones with wings on a mating flight.

And I've also come to think that it's one of three basically different brain systems that evolved from mating and reproduction.

And I've also come to think that it's one of three basically different brain systems that evolved from mating and reproduction.

We believe that it is equally important to prepare the pupils for the mutually satisfactory mating and the successful child rearing.

It's the interchange of ideas, the meeting and mating of ideas between them, that is causing technological progress, incrementally, bit by bit.

There's something I'm developing here called social intensity syndrome, which tries to account for why guys really prefer male bonding over female mating.

And it is He who, from fluid, created the human being. Then He made relationships through marriage and mating. Your Lord is Omnipotent.

And it is He who, from fluid, created the human being. Then He made relationships through marriage and mating. Your Lord is Omnipotent.

So they went on about their business and from a foot away, we're watching mating and courting and fighting and it is just an unbelievable experience.

Now, if they are the first to... discover the mating habits of sea horses... must we then race them to discover the inner structure of a grasshopper's brain?

It happened during mating season that I lifted up my eyes, and saw in a dream, and behold, the male goats which leaped on the flock were streaked, speckled, and grizzled.

And I've gone to more than 20 countries in the last few years with Mating in Captivity, and I asked people, when do you find yourself most drawn to your partner?

Now if this signal is used for males and females to find each other for mating and they're dispersed, imagine the impact this could have on the recovery of endangered populations.

It happened during mating season that I lifted up my eyes, and saw in a dream, and behold, the male goats which leaped on the flock were streaked, speckled, and grizzled.

I was doing a pathetically slow speed of about 1.3 knots, and they were doing only marginally less pathetic speed of about 1.4 it was like two snails in a mating dance.

At TEDGlobal 2010, author Matt Ridley shows how, throughout history, the engine of human progress has been the meeting and mating of ideas to make new ideas. It's not important how clever individuals are, he says what really matters is how smart the collective brain is.

The story I wanted to do initially was just a small focus to look at the few weeks each year where these animals migrate down from the Canadian arctic to the Gulf of St. Lawrence in Canada to engage in courtship, mating and to have their pups.

In the deep, dark ocean, many sea creatures make their own light for hunting, mating and self defense. Bioluminescence expert Edith Widder was one of the first to film this glimmering world. At TED2011, she brings some of her glowing friends onstage, and shows more astonishing footage of glowing undersea life.

But Russian memory is also subject to Western style postmodernist mockery. A recent fashion in St. Petersburg are restaurants with names such as Lenin's Mating Call, USSR, and Russian Kitsch, which has frescos showing collective farmers socializing with American Indians while Leonid Brezhnev, resembling Frank Sinatra, gives a speech to a stone age tribe.

As Darwin did not believe that pure aesthetics would guide female peacocks and lions in their choice of mating partners, he had to find a rational reason for females preference for males with hindering characteristics. The very fact, he reasoned, that these features make life harder signals to prospective partners that individuals who can do reasonably well with them have an especially good genetic set up and are thus likely to produce strong offspring.