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The brown pelican is a coastal bird. It was _1_ as an endangered species in the United States in 1973. _2_ that time, the numbers of this kind of bird have increased, mainly _3_ restrictions on the _4_ of the pesticides such as DDT.
But even _5_ interference from humans, there are many factors which affect hte survival of brown oelican babies.
An adult brown pelican must catch about 20 percent of its body _6_ in fish every day for its own survival. And the first 11 to 12 weeks after their babies are born, the mother and father _7_ must find another 125 pounds of fish if ther have three babies. After that period of _8_ care, the parents abandon the young birds who then must learn to _9_ for fish for themselves. They have a certain _10_ of fat stored in their bodies to get them through this experimental stage.

1 A named B kept C listed D called
2 A From B By C Before D Since
3 A because B because of C through D for
4 A apply B effect C matter D use