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 blue colorful colors hunt walking walk summer Rhine-Westphalia hunting Europe pale pile stake animals Spitzbergen