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There was considerable debate about the cause of the decline in Guam's birds. Some scientists argued that pesticides were to blame, whereas others believed that avian diseases might be At Fault. The native birds might, for example, be susceptible to diseases carried by introduced birds or domesticated chickens and pigeons. Introductions of competing birds could aiso be responsible, not to mention the familiar list of introduced predatory rats, cats, and other mammals.

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Q: What caused Guam's territorial bird to lose its ability to fly?
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