PRAGUE (AP) — Keepers at Prague Zoo used tons of ice on Thursday to give its animals some much-needed relief as yet another heat wave hit Europe. Polar bears Aleut and Gregor wasted no time and were rolling in the beds of ice cubes after entering their outside enclosure. “The bears cool off with it and at the same time it’s an enrichment of their life in the zoo,” said zoo spokesperson Filip Mašek. But the first heat wave struck early and the Czech Republic experienced its hottest day ever with 41.9 C (107.4 F) on June 28. Other animals that have benefited from the provision of ice to keep cool in previous years include otters, elephants and parrots.