Harderwijk, Netherlands. 27th February 2013. Trainers of the marine mammal park Dolfinarium in the Dutch city Harderwijk, are Wednesday 27-2-2013 busy to get the dolphins in top condition for the new season, which starts on April 27. Because the large dome and basin of the dolphin theater is now being renovated, all dolphins are housed in the so-called Dolphin Delta. For the eight 'show animals' is that an unknown environment. Normally during the winter-closing, the dolphins can be trained six months for a new show. Credit: dpa picture alliance / Alamy Live News

- Image ID: D40N5N
Harderwijk, Netherlands. 27th February 2013. Trainers of the marine mammal park Dolfinarium in the Dutch city Harderwijk, Stock Photo
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Harderwijk, Netherlands. 27th February 2013. Trainers of the marine mammal park Dolfinarium in the Dutch city Harderwijk, are Wednesday 27-2-2013 busy to get the dolphins in top condition for the new season, which starts on April 27. Because the large dome and basin of the dolphin theater is now being renovated, all dolphins are housed in the so-called Dolphin Delta. For the eight 'show animals' is that an unknown environment. Normally during the winter-closing, the dolphins can be trained six months for a new show. Credit: dpa picture alliance / Alamy Live News
dpa picture alliance / Alamy Stock Photo
Image ID: D40N5N
HARDERWIJK - Trainers of the marine mammal park Dolfinarium in the Dutch city Harderwijk, are Wednesday 27-2-2013 busy to get the dolphins in top condition for the new season, which starts on April 27. Because the large dome and basin of the dolphin theater is now being renovated, all dolphins are housed in the so-called Dolphin Delta. For the eight 'show animals' is that an unknown environment. Normally during the winter-closing, the dolphins can be trained six months for a new show. This time is that the maximum of one month. Until mid-March, the dolphin theater is not ready. So the dolphins have to wait to get back to their familiar place. Because the Dolfinarium starts a completely new dolphin show, the trainers and dolphins face their greatest challenge ever. Photo: Trainer Joyce Hazelof is 'playing' with the dolphins behind the glass of the underwater restaurant. Foto: VidiPhoto dpa - NETHERLANDS OUT