Imagine you're a field biologist who studies penguins. You go all the way to Antarctica. You finally get up close to a noisy, smelly colony of the birds. But once they see you, they start to freak out. Some retreat with their eggs, and in the process, they encroach on their neighbors' turf. Now the penguins are fighting. The social order of the colony is disrupted. You've tarnished the data you were trying to collect about penguin behavior.
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