This is a video called European herring gull and lesser black-backed gull.
From Dutch bird researchers SOVON:
Gulls with satellite transmitters
In close cooperation with the German “Institute of Avian Research” SOVON participates in a large international research program financed by the “European Space Agency” (ESA). Partners in this program are “Computational Biogeography and Physical Geography (UvA)” and “Centre for Limnology (NIOO-KNAW)”.
Our project focuses on following the movements of Lesser Black-backed Gulls, Herring Gulls and Barnacle Geese using satellite transmitters. The overall aim of the FlySafe program is to prove the added value of the integration of space-based systems (meteorology, earth observations, telecommunication etc.) and earth-based systems to improve flight safety. …
In the third issue of SOVON-nieuws jaargang 2007, we report on the first results of the project. On this site the tracks of individual Lesser Black-backed Gulls and Herring Gulls are made available (we will catch the Barnacle Geese this autumn). Those who have installed Google Earth on their computer can download for each gull the kml file with the complete track and study this track in Google Earth.
Niko Tinbergen‘s herring gull experiments criticized: here.
Dear Kitty. Some blog 
Deck that Gull
Guano is the mother of invention
by Maureen Miller
Resilient seabirds, fantastic in flight but foul when perched, gulls come from a big family. Of the 87 birds in the avian family Laridae, 50 are gulls. That’s a lot of gulls, from the common grey-and-white herring to the squid-eating, night-feeding swallow-tailed gull of the Galapagos Islands.
Several species frequent Chesapeake Bay, including the impressive great black-backed, with its massive yellow bill and up to five-foot wingspan; the basic herring gull; the abundant wintering ring-billed gull, with black ring near the tip of its yellow bill; and the laughing gull, which lives up to its name and sports a black hood when breeding.
No gull is choosy about meals. Scavengers by design, these birds feast off stuff we discard. Kleptoparasitic by nature, they flourish by robbing from others.
Humans are little choosier. During the 17th and 18th centuries, many a gull graced the tables of the great houses of Europe. Early North American settlers brought with them the taste not only for gulls’ flesh but also for their eggs. What the appetites of lords, ladies and settlers didn’t do to wipe out gull populations, the millinery trade did — using not only the feathers but also whole birds to decorate ladies’ hats.
http://www.bayweekly.com/year08/issuexvi22/reflectxvi22.html
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