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What do you mean by “effort” and why do I have to enter time and distance information?

Information about how much time you spent watching birds and how far you traveled will help us determine the relative abundance of the birds you reported. For example, finding 50 Black-capped Chickadees in 15 minutes while standing in one place indicates a much different density of chickadees than if you recorded 50 Black-capped Chickadees in four hours while driving 10 miles. Without the time and distance information, eBird biologists won’t be able to make a reliable estimate of density. 
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