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Shorebirds inhabit many kind of different habitats all around the world. The name confuses many bird lovers but shorebirds don't exclusively occur on shores. From alpine habuitats, to wet grasslands, salt marshes, sewage ponds, salt pans, urban habitats, mangroves, semi-deserts, woodlands, rainforests, arid steppes or agricultural fields, they all can be found.
The more, the better. Rather than submitting multiple checklists from one location, the ideal would be to cover as many different areas as possible during the week/long counts. On the other hand, migrating numbers can be changed dramatically within counting week, so if you only have a single'shorebird' location around you, it can be interesting to see the changes.
There is a never-ending debate about what species are considered to be shorebirds. Many think that all birds, like pelicans, skimmers, gulls, terns and even herons, inhabiting the shores, are shorebirds. World Shorebirds Day follows the IOC taxonomic list for shorebirds what contains a good number of species which uses other habitats than beaches.
The list of shorebirds can be found at this link:
https://www.worldshorebirdsday.org/list-of-shorebirds