The in this application stored information about names, addresses etc will not be shared with third parties.
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Under some interesting links towards (cr-)birding websites (also the US)

Birdwatching Guide For All Levels (2020)

Homeowner’s Guide to Birdwatching From Your Backyard

Birdwatching Guide for the whole family
Birdwatching – otherwise known as birding – can be fun for everyone in the family.

Complete Guide to bird-watching from your window
bird-watching is a very rewarding hobby (US)  

Introducing Your Kids to Bird Watching in Your Backyard

Beginner’s Guide to Bird Watching
The Best ... to Bird-Watch (US)

Make your own plastic bottle bird-feeder

How to Get Started With Birding – An Introductory Guide  (UK)

A Homeowner's Guide to Identifying Birds

Official Birds of the United States

Birding on a Budget : A Complete Guide for Kids and Adults (US)

Flowers and plants to attract birds and other wildlife

How to Turn Your Garden Building Into a Wildlife Watching Room

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EURING, co-ordinating bird ringing throughout Europe and report a colour-ring

International Wader Study Group (IWSG) : The International Wader Study Group is an organisation of enthusiastic professionals and amateurs researching waders, also called shorebirds.

Ornithological Station, Museum and Institute of Zoology of the Polish Academy of Science.

Wetlands International, global links to colour-marking schemes & satellite tracking programmes of waterbirds.

Wetlands International, colour marking of waterbird groups/species undertaken/coordinated in Eurasia/Pacific.

The Partnership for the East Asian-Australasian Flyway, coordination of colour marking.
Colour Markings used East-Asia-Australasian Flyway.

Japanese Bird Banding Association.

The Ornithological Society of New Zealand (Inc.).

Arctic wader colour-banding project.

African Bird Ringing Scheme (AFRING).

Animal Demography Unit, colour-ringing of colonial waterbirds on the Cape peninsula.

The North American Bird Banding Program and the Bird Banding Office of Canada , United States Geological Survey's Bird Banding Laboratory (BBL) jointly administer the North American Bird Banding Program.

Bird Banding in America, especially South America.

Ringing Center of the Russian Raptor Research and Conservation Network.

Banded Gulls on Sable Island, Nova Scotia.

Ring-billed Gulls in North  America

Other Gull ringing in North America.

The Working Group on Waders , colour-marking of waders.

Photo-Guide to Colour-Ringed Birds, website of Marco Basso.

Wetlands International, Cormorant Research Group, website of Stefano Volponi.

Dutch Gull project, website of Frank Majoor.

Belgium Black-headed Gull project, website of Tim Audenaert.

Mediterranean Gull

Gull Research Organisation

Grampian Ringing Group

Grupa Badawcza Ptaków Wodnych "KULING"

Centre de Recherches sur la Biologie des Populations d’Oiseaux : CRBPO

Le piegephoto comme outil de suivi pour bagues couleurs.