Last updated at 17:09

Leah helps to save some eels

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Leah's been getting hands-on with some pretty slippery creatures.

She's taking part in one of Britain's most ambitious conservation projects releasing thousands of eels into the wild.

Leah is learning all about the life of eels as part of BBC Autumnwatch, and she's been helping the team at London Zoo box up 25,000 of them, ready for their release into a lake in Wales.

They are very shy, hiding amongst rocks and mostly feed at night.

Her mission will see her travel across Britain to find out why the species are in crisis and what's being done to encourage its survival.