What is the fastest seabird species in level flight?

To: Birding Aus <>
Subject: What is the fastest seabird species in level flight?
From: Laurie Knight <>
Date: Fri, 20 Jan 2017 11:13:30 +0000
The Spirit of Tasmania averages 27 knots (or around 50 km/hr) on its Bass 
Strait crossings.  This is a fair bit faster than the tubs that take birders 
out on pelagic trips. While travelling on the ferry last month, I was 
fascinated to see how effortlessly the seabirds (albatross, shearwaters, 
prions) kept up with the ship.

That got me thinking about just how fast seabirds can fly.  What are the 
pelagic equivalents of swifts, how fast can they fly, and how far can they fly 
at that speed?

Regards, Laurie.

[Note, there are no references to unladen African or European Swallows in the 
above query].
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