SommerBad , Open Air , Jacuzzi

Every summer the numerous open air pools in Berlin open and one can enjoy out of doors swimming in heated water.  On my trek ( cycling) I spotted these pigeons with their own version. Rather like  a Jacuzzi .It wouldn't be heated but they were  having fun splishing and splashing .Even other birds joined in .No prizes for guessing who patrolled rather akin to life guards