Choose the option that best answers the question.
What does the professor mean when he says this?
The researchers working at the Delaware Bay have manipulated the population data on the migrating shorebirds.
The fluctuations in population vary because not all species of shorebirds are endangered.
The Delaware Bay is not the only place where migrating shorebirds can stop to rest and refuel on their journey.
Such high numbers of birds in one place mask the global decline of shorebird populations.
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