What Caused the Dramatic Decline in Guam's Native Bird Species

question 10

Multiple Choice

What caused the dramatic decline in Guam's native bird species?

• A) climatic change in the region
• B) the elimination by humans of its food supply
• C) the thinning of their eggshells and the subsequent death of their young as a result of heavy DDT use on the island in the 1970s
• D) radiation poisoning caused by nuclear tests of the United States and France
• E) the accidental introduction of the non-native brown tree snake

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