报告承认计数可能包括了死于自然原因的鸟类和野生动物。
The report admits their counts may include birds and wildlife felled by natural causes.
因此，尽管粗略，物种状态的计数让自然资源保护学家们感受到行星上生命的脉动。
So, as crude as they are, tallies of species' statuses let conservationists take the pulse of life on the planet.
研究中观察到的统计数字加重了这种轻微的自然失衡。
The statistical bumps observed in the study are in addition to that slight natural imbalance.
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