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Figs. 1a-d. Number of high frequency calls (primarily warblers & sparrows) by date: 2016-2018

Fig. 1a. Nightly warbler and sparrow calls detected at Stations 1,2,3,4,5 & 7, May 4-16, 2016 (8:30pm-5:30am).

Fig. 1b. Nightly warbler and sparrow calls detected at Stations 1,2,3,4,5 & 7, May 17-29, 2016 (8:30pm-5:30am).

Fig. 1c. Nightly warbler and sparrow calls detected at Stations 2,3 & 6, May 4-16, 2017 (8:30pm-5:30am).

Fig. 1d. Nightly warbler and sparrow calls detected at Stations 2,3,5 & 6, May 17-Jun 4, 2017 (8:30pm-5:30am).

Fig. 1e. Nightly warbler and sparrow calls detected at Stations 2,3,5 & 6, April 27 - May 20, 2018 (8:30pm-5:30am).