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Why Do Kestrels Soar?

Fig 3

Relative frequency of commuting flights recorded at 1-second intervals with and without thermal soaring events in relation to solar radiation.

Solar radiation is presented in categories of 200 Wh/m2. Numbers of commuting flights, tracking hours and tracked lesser kestrels per category are indicated above the bars.

Fig 3

doi: https://doi.org/10.1371/journal.pone.0145402.g003