A Swan couple having their nest close to a black headed gulls colony, close by a grebe couple building on some water platform like nest. One of the swans having a short dialogue with the grebes resulting in their leaving the place. The black headed gulls on the other hand launched several attacks on the previous years swans at this place close by gulls colony.
April 2 2014 at the lake Østensjøvannet nature reserve in Oslo.
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