Winter's cold brings out the playful side of seals at the Belgrade Zoo.<br/> <br />And it seems the cats like rolling snowballs just as much as their human counterparts.<br/> <br />The Serbian Zoo is a breeding center for white lions.<br/> <br />With temperatures around minus 10 Celsius and expected to drop below minus 25 next week, some animals prefer to stay inside where its warm.<br/> <br />The Zoo uses heating lamps and takes other precautions to protect its residents.<br/> <br />One zookeeper breaks up ice from a precarious perch for the swans waiting nearby.<br/> <br />The cold spell that is also affecting much of Europe has prompted Serbia to declare a state of emergency in 32 municipalities.<br/> <br />Lindsey Parietti, Reuters
