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The apparent rediscovery of the Ivory-billed Woodpecker Campephilus principalis in Arkansas, USA, …

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- Video analysis of the escape flight of Pileated Woodpecker Dryocopus pileatus: does the Ivory-billed Woodpecker Campephilus principalis persist in continental North America?

Table 1

Frame numbers of David Nolin's video that mark the midpoint (wings approximately horizontal) of escape flight of Pileated Woodpeckers
	Wingbeat no.

	0	1	2	3	4	5	6	7	8	9	10	11

PIWO flight 1	165	169	173	177	182	193	211	-	-	-	-	-
PIWO flight 2	303	307	310.5	316	321	327	334	341	348	358	364	369
PIWO flight 3	429	432.5	436	439.5	443	450	456	463	473	-	-	-
PIWO flight 4	747	751	754	758	762	767	771	777	783	790	797	-
Collinson BMC Biology 2007 5:8 doi:10.1186/1741-7007-5-8

Mean wingbeat rates for escape flights of Pileated Woodpeckers over the first four wingbeats, the second four wingbeats, and the overall mean, combining both phases of flight
	mean wingbeat rate (beats s^-1)

	Wingbeats	Wingbeats	Overall

	1–4	5–8	mean

PIWO flight 1	7.1	-	3.9
PIWO flight 2	6.7	4.4	5.0
PIWO flight 3	8.6	4.0	6.7
PIWO flight 4	8.0	5.7	6.0
Luneau video	8.6	8.6	8.6
The underlined results represent rates that are comparable or equivalent to the woodpecker described in Fitzpatrick et al [1]. Calculations based on data presented in Table 1.
Collinson BMC Biology 2007 5:8 doi:10.1186/1741-7007-5-8

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