The zoo in the western Polish city of Wrocław appealed for help on Tuesday ahead of an expected flood wave on the Oder river, which forecasters say will reach the city later in the week. “Dear friends, we need your help. If you have the opportunity and free hands to work, please help us fill sand into bags,” the zoo directorate wrote on Facebook on Tuesday. It said it was looking for 50 volunteers for the sandbagging effort. Just a short time later, it added that enough people had already been found for the job. There is major flooding in many places in south-west Poland after persistent heavy…