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Changes in the location or failure of parts of transects of the survey design may have implications for the reliability of seabird and porpoise trends.

In the period from 1990 to 2017, the populations of 13 out of 20 breeding bird species typically found in cities has declined in urban areas.

Cities are an important habitat for a variety of birds, but the nine species most common in urban areas, according to the garden birds counts conducted in the period 2003–2006 decline.