Flag Fen is home to many insects, birds, amphibians and mammals.
The majestic heron can often be seen posing next to the banks of the mere and drainage ditches that surround the park. Lesser seen birds include the Cuckoo and Fieldfare in Spring. The mere and moat around the visitor centre provide the perfect home for rare water voles and many different types of dragonflies.
Other animals that you are likely to see on your visit are rabbits, stoats, toads and squirrels. You may also catch a glimpse of other lesser-seen animals such as badgers, foxes, deer and grass snakes if you are lucky.