By Euronews
Published on
Heidi turned two on December 20 and spends her days exploring her habitat with her mother Sophia.
Heidi the orangutan at Brookfield Zoo near Chicago is celebrating her second birthday.
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Zoo keepers say she's becoming more adventurous but still stays close to her mother.
She's on solid food now but will continue to nurse until she's between 4 and 6 years old.
Experts say young orangutans stay with their mothers until about age eight, one of the longest dependencies of any mammal.