The Yellow-legged Gull (Larus michahellis) established as a breeding species in the town of Tg.- Mureș from the year 2004. Since then 1-5 pairs regularly breed in the centre of the city. In 22nd July 2007 we received an injured fledgling which was rehabilitated during four days. In 25th July the condition of the bird was appropriate to be released. After ringing we set free the bird near the Mureș River. We follow the bird’s daily activity together with 4 more juveniles and few adults.