An adorable polar bear cub named Nanook had fun at its first birthday party at a zoo in Gelsenkirchen, Germany, on Tuesday. /VCG Photo

Accompanied by its mother Lara, Nanook helped itself to specially-made fruit ice cakes and received a toy ball as a surprise gift prepared for the birthday bear. /VCG Photo

Nanook was born on December 4, 2017. After its birth, the baby bear lived with its mother inside a cave until the cub made its public debut in April. /VCG Photo

Polar bears are listed as "vulnerable" on the International Union for Conservation of Nature's Red List of Threatened Species, due to a significant loss of Arctic Sea ice from climate change, ABC News reports. /VCG Photo