The Wildlife Conservation Society has been engaged in water bird surveys in Mongolia since 2005. During the summers of 2007 and 2008 part of this work has been focused on the marking of birds to facilitate studies of migration and population characteristics. Birds are fitted with colour marks such as neck collars (geese and swans) and leg flags (waders) that can be easily identified by observers in the countries through which the birds migrate and spend the winter. By reporting observations of marked birds, observers help us piece together the bird's life histories, their movements and needs and in so doing assist in our ability to conserve them.

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