21.   The canyons are deep, heavily forested and rich in wildlife, particularly birds that migrate here from tropical regions.

22.   The dry weather was blamed on El Nino, a weather phenomenon that originates in tropical regions of the Pacific Ocean.

23.   The El Nino weather pattern, occurring every few years, consists of slowing trade winds and warming water temperatures in tropical regions of the Pacific Ocean.

24.   The El Nino weather pattern is characterized by slowing trade winds and warming water temperatures in tropical regions of the Pacific Ocean when it occurs every few years.

25.   The very common melanogaster type originally came from a tropical region of Africa but like the others is now cosmopolitan.

26.   Yet they are also a menace to humans who try to farm in tropical regions of the New World.

27.   Dengue fever is common throughout the tropical regions and is endemic in India, Sri Lanka, Bangladesh, Vietnam and parts of the Caribbean.

28.   Dozens of policemen combed through a tropical region in Bolivia for the killers of a Roman Catholic nun and priest from Colombia, police said Wednesday.

29.   Dozens of policemen were combing through a tropical region in Bolivia for the killers of a Roman Catholic nun and priest from Colombia, police said Wednesday.

30.   Nishikawa said the spiders might have arrived with lumber imported from tropical regions.