A useful field notebook records more than the results a researcher expected to find. Careful obse describe unu events a record chan conditions bec these det sometimes exp unexpected res during la analysis o the data. A note about sudden rain, for instance, may explain why fewer insects were counted on one afternoon. Without that information, a later reader might mistake a temporary change for a lasting trend. Records are most valuable when another person can understand how an observation was made, including the practical limits of the method.

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