The Pesky Polar Bear — Amelia Cobb

When Great-Uncle Horace brings back lost and homeless animals from his travels around the globe, it falls to Zoe, and her mum the zoo vet, to settle them into their new home. She's good at this, because she can understand what they say and talk to them, too. But that's a secret! In the seventh book in the series, Zoe's planning a surprise party for her mum's birthday. But Snowy the Polar Bear is being just a little too bossy...