Polar Bear Ice Ursus maritimus Ursidae POBE URSMAR Mammal Predator Behavior dangerous fur white cold snow global warming pack ice drift floe threatened melting melt arctic Arctic Zone North Pole polar region marine sea landscape icescape symbol symbolic allegorical emblematic thoughtful thought-provoking alarming worrying concerning solitude lonely solitary animal loner Svalbard Norway July Summer Spitsbergen snowy hunter vulnerable endangered pole danger water wild nature frozen climate-change climate harp seal Pagophilus groenlandicus bloody skeleton catch Feeding scene blood red blue colorful colors deadly dead kill hunt prey successful food hungry bones carcass summer Rhine-Westphalia hunting Europe feeding pale pile stake animals Spitzbergen