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. 2014 Mar 18;9(3):e92218. doi: 10.1371/journal.pone.0092218

Figure 2. Seasonal variation in warbler and sparrow nocturnal flight call rates.

Figure 2

Seasonal variation in the number of nocturnal flight calls (NFCs) detected per active microphone for warblers (white fill) and sparrows (gray fill) during fall migration in (A) 2010 and (B) 2011 at eight coastal sites in southern Rhode Island, USA.