Walker the polar bear plays with a hard hat on his third birthday at the Highland Wildlife Park on December 7, 2011 in Kingussie, Scotland. Walker was born in Rhenen Zoo in Holland on 7th December 2008. He came to live at the Highland Wildlife Park after his aunt, Freedom, became pregnant and needed to retire to her cubbing den, his mother was also due to come on heat and be reintroduced back to the Zoo’s adult male, Walker’s dad. (Photo by Jeff J Mitchell/via Getty)
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