Figure 2.

Interspecific comparison of (a) mean time spent flying per day (mean=4.1±5.1 h d⁻¹) and (b) mean percentage of time spent flying per active period (from dawn to dusk, mean=15.6±17.1% of daylight). Black bars are the mean result for common eiders (SOMO, Somateria mollissima) in this study: eiders spent 0.66% (or 0.16 h d⁻¹) of their time flying per 24 h and, to be consistent with other daylight studies, eiders spent 0.96% of their time flying per active period. (APAP (Apus apus), AUFL (Auriparus flaviceps), BURE (Buteo regalis), BUSC (Bubo scandiacus), CAAN1 (Calypte anna), CAAN2 (C. anna), CACA (Cardinalis cardinalis), CAPU (Calidris pusilla), CHWI (Charadrius wilsonia), CYBU (Cygnus buccinator), DECA (Dendroica caerulescens), DEUR (Delichon urbica), ELCA (Elanus caeruleus), ELLE (Elanus leucurus), EMMI (Empidonax minimus), EMTR (Empidonax traillii), ERRU (Erithacus rubecula), EUCY (Euphagus cyanocephalus), FASP (Falco sparverius), FATI1 (Falco tinnunculus), FATI2 (F. tinnunculus), HALE1 (Haliaeetus leucocephalus), HALE2 (H. leucocephalus), HIRU (Hirundo rustica), HITA1 (Hirundo tahitica), HITA2 (H. tahitica), LADO (Larus dominicanus), LALU (Lanius ludovicianus), MEFO (Melanerpes formicivorus), MEFU (Melanitta fusca), MEVI (Merops viridis), MOCA (Morus capensis), PAMO (Parus montanus), PHCA (Phalacrocorax carbo), PHNI (Phainopepla nitens), PINU (Pica nuttalli), PRSU (Progne subis), RIRI (Riparia riparia), RITR (Rissa tridactyla), SPAM (Spiza americana), STFU (Sterna fuscata), STVU (Sturnus vulgaris), TORU (Toxostoma rufum), VIOL (Vireo olivaceus) (see appendix in the electronic supplementary material for details)).