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. 2010 Nov 11;5(11):e13956. doi: 10.1371/journal.pone.0013956

Figure 6. Heart beat frequency (f H) traces of two European bee-eaters engaged in different activities during stopover and cross-country flight.

Figure 6

(A) f H of bird no. C48417 during stopover on May 5 2006 in relation to bird activity. A sample of this data can be heard in Audio S2. (B) f H of the same bird on the following day, 6 May 2006, during cross-country flight. A sample of this data can be heard in Audio S1. (C) f H of bird no. CC30955 on May 25 2006. The bird was followed during stopover in the early morning and then took off (dashed vertical line) for cross-country flight in which it was followed for a distance of 90 km from the stopover site until its signal was lost. Time is GMT; add two hours for local time.