To suggest: Hypothesis for the decline in the number of migratory songbirds in USA due to pesticides, although the implicated pesticides are not used in the United States since the 1970s. Concept introduction: Birds exhibit the peculiar movement called migration where they commute across large distances, crossing large oceans for propagating their species and escape the unfavorable conditions in their native lands. The migratory songbirds of the United States usually migrate to Central and South America. When the winter begins in United States, the songbirds migrate to the tropical warm climate of Central and South America. The migratory pattern of the birds has been severely disrupted due to several activities of the human beings.

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Chapter 38, Problem 12TYK

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To suggest: Hypothesis for the decline in the number of migratory songbirds in USA due to pesticides, although the implicated pesticides are not used in the United States since the 1970s.

Concept introduction: Birds exhibit the peculiar movement called migration where they commute across large distances, crossing large oceans for propagating their species and escape the unfavorable conditions in their native lands. The migratory songbirds of the United States usually migrate to Central and South America. When the winter begins in United States, the songbirds migrate to the tropical warm climate of Central and South America. The migratory pattern of the birds has been severely disrupted due to several activities of the human beings.

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