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. 2016 Mar 18;11(3):e0151099. doi: 10.1371/journal.pone.0151099

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© 2016 Boström et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 2 — Averages are shown together with ranges (brackets). Seven collared and eight pied flycatchers were repeatedly tested at up to five different light intensities each: 160 (n = 5 collared + 4 pied), 350 (n = 7 + 4), 750, 1500 (n = 7 + 8) and 3500 cdm^-2 (n = 6 + 7). The critical flicker fusion frequency (CFF), with a maximum of 141 Hz and 128.1 ± 9.8 Hz (±SD) on average for the collared flycatchers and up to 146 Hz and 138.2 ± 6.5 Hz on average for the pied flycatchers, was attained in both species at 1500 cdm^-2.