The picture shows a young long-eared owl (<i><a href="//commons.wikimedia.org/wiki/Asio_otus" title="Asio otus">Asio otus</a></i>), probably after one of its first flying tries. It sits on a stump next to the Alster.
<a href="//commons.wikimedia.org/w/index.php?title=User:%C3%89claircie&amp;action=edit&amp;redlink=1" class="new" title="User:Éclaircie (page does not exist)">Éclaircie</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>