On balance, the large families left just enough people alive to keep the total population at a steady size.

But to keep the whole population under siege for so long, this is horrible.

If you return them to the colony they keep the next population from moving in.

My brother used to say it had something to do with keeping the population in balance.

The government thinks the psychologists can keep the population under control.

The business from those few short months was enough to keep the local population fed through the winter.

In those countries it is trapped and hunted to keep the population down.

My job in this town is to keep the population plastered.

Never going outside, killing people to keep the population in perfect balance.

I suppose it's a way of keeping the population down.