This week we answer questions from Oscar, Harry and Caleb. They would like to know why penguins can't fly, why snakes shed their skin and how big can a giant crab get to? We find out why chubby penguin Dads are popular, how penguins that build nests for their eggs poo without making the nests messy, why snakes shed their skin and all about different giant crabs, where they live and what they get up to. Our special guest expert this week is Suzi, a keeper at ZSL London Zoo who knows all about penguins. Tune in to find out all the answers and more as well as how you can win a family ticket to London Zoo during the Christmas holidays.

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