21.   Left alone by hunters, the humpback population began to recover almost immediately.

22.   Pension and labor shortfalls are the most daunting hurdles facing Europe, Japan and other parts of the developed world as their working-age populations begin to shrink.

23.   The heavily-armed civilian population has begun to hand over weapons left over from two decades of civil war, an official said Monday.

24.   When the population of songbirds began suffering from the cold at night, zoo keepers put them in cages inside their own cramped sleeping quarters.

25.   Within a decade, the total population will begin to fall.

26.   The rhino population even began to grow.

27.   On Thursday, the Algiers press said the Medea population had begun to organise resistance to Islamic extremist who have stepped up attacks in the region.

28.   The local population began protests against the alleged slight on Thursday and the protest turned violent on the following day.

29.   The local population began protests against the alleged slight on Thursday and the protest turned violent the following day.

30.   The opposition, meanwhile, has threatened to call on the population to begin a civil disobediance campaign by not paying electricity bills or a television tax.