In 2011, breading birds were monitored within the Natura 2000 SPA Wkra and Mławka River valleys on an area of 287.5 km2. We recorded 134 breeding species, and numbers of 76 species were estimated. The most abundant species comprised Meadow Pipit Anthus pratensis (387 pairs), Thrush Nightingale Luscinia luscinia (362) and Grasshopper Warbler Locustella naevia (203). We noted 22 breeding or probably breeding species listed in Annex I to the Council Directive 2009/147/WE. Numbers of the Corncrake Crex crex (122 territorial males) and Bluethroat Luscinia svecica (63 pairs/males) exceeded the qualification limits for important bird area of international importance. Birds important at the country scale nesting in the important bird area comprise the Curlew Numenius arquata (13 pairs) and the Common Snipe Gallinago gallinago (190 pairs). The Wkra and Mławka valleys are an important refuge in Mazovia for the following species listed in Annex I to the Council Directive 2009/147/WE: the Black Stork Ciconia nigra (3 pairs), White Stork Ciconia ciconia (117), Lesser Spotted Eagle Clanga pomarina (7), Marsh Harrier Circus aeruginosus (24-26), Crane Grus grus (74), Red-backed Shrike Lanius collurio (236) and Barred Warbler Sylvia nisoria (152). Numbers of 5 species of Natura 2000 increased and of 3 species declined.
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