The mating cry.

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.

It is a form of assortative mating.

The mating call of the moose.

So this is the assortative mating hypothesis of these genes reinforcing one another in these structures.

For such huge birds, mating is a gentle affair

In some species, the female will eat the male after mating, but in any event, the male will not survive for long after mating.

There was little interaction or intermarriage.

This mating was a particularly agressive mating.

What if mating season never ends?

I mean it's rather uncommon to have this marriage, a long time to put those two together.

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

Many times, we use products either men or women, to improve our position in the mating market.

That (Laughter) is not the way any human being speaks casually.

The live duck mounted the dead duck, and started to copulate.

If they mate successfully, then no offspring.

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

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

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

She began to harass him and this is where these two began the first mating that we saw.

Moving on to mating, something that I think everybody here would be interested in.

After mating, the fertilized egg remains in a suspended state until August or September.

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

At the end of its breeding cycle, the Great Basin Spadefoot toad digs itself down about a meter under the hard panned desert soil of the American West, where it can stay for many seasons until conditions are just right for it to emerge again.

If you look at the cardinal, he's engaging in what's called nuptial gift giving.

Every bit of time we got to witness their mating for the last time on the edge of the thick miscanthus grass.

In that top line the ram, he needs more and more time to make with the same old ewe.

In modern times, with improved transportation infrastructure, there has been much intermarriage between these groups.

And it's a welcoming area, I think, inclusive of diversity, reflective of diversity, and I think this marriage of both technology and art in the public sector is an area where the U.S. can really take a leadership role, and Chicago is one example.

It's typical for leopards to mate probably every half hour in the first several days of their mating.

The branches just didn't quite present a perfect place for them to copulate at all.

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

So the large baleen whales will produce long, beautiful songs, which are used in reproductive advertisement for male and females, both to find one another and to select a mate.

Locomotion The female worker ants do not have wings and reproductive females lose their wings after their mating flights in order to begin their colonies.

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

The mating season occurs between September and December, during which the loud barks males make could be easily heard.

For this purpose, the first pleopods (legs attached to the abdomen) of the male are constructed as mating tools.

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

You take a problem that you can't solve with a pure mathematical answer, you build an evolutionary system to try multiple tries at guessing, you add sex where you take half of one solution and half of another and then make new mutations and you use natural selection to kill off not as good solutions.

The great sparrow is an exception, breeding in solitary pairs and remaining only in small family groups in the non breeding season.

Most Medusa jellies make special structures called polyps, that simply bud off babies with no need for sex.

Mating can be either monogamous or promiscuous for both males and females, and mating can include individuals from outside the group.

Mating occurs in July or August, and after a gestation period of 11 weeks, the female gives birth to 2 4 young.

As mentioned, animals may also use display behavior during direct competition between them for a resource other than mates.

New queens and males (drones) are produced towards the end of the summer, and after mating, the queens hibernate over winter in cracks or other sheltered locations.