RFI re Recommended Telescopic Lens for a Camera

Hi Everyone,
My wife has a Olympus OM-D camera and is a very keen photographer of landscapes, buildings and flowers.
More recently she has become interested in taking bird photos but only has a 300mm telescopic lens which is somewhat limiting.
Can someone please recommend a telescopic lens which would be more suitable for bird photography, and would fit this particular camera?
Any other associated advice would also be appreciated.
Cheers Martin

Martin Woodward

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