Fig. 2From: Miniaturized multi-sensor loggers provide new insight into year-round flight behaviour of small trans-Sahara avian migrantsCumulative hours of flight of eurasian hoopoe (N = 5) and great reed wabler (N = 13) from July 2015 until April 2016. (a) Seasonal activity periods coincide with post- and pre-breeding migration in the hoopoe, while (b) reed warblers have an additional activity phase marked as intra-tropical movementsBack to article page