Collision mortality has no discernible effect on population trends of North American birds.

The correlation between log 10 building mortalities (m) and log 10 population size (N) was highly significant ( r = 0.57, P <0.0001, n = 147), as was the correlation between log 10 tower mortalities and log 10 population size ( r = 0.43, P <0.0001, n = 188) ( Figure 1 ).

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