A large assemblage of breeding birds including nationally rare species such as Cetti's warbler (Cettia cetti) is also associated with the reedbed, fen and open water habitats found at Thatcham Reed Beds.
Thatcham Reed Beds is known for its diverse bird population, particularly those that breed in the reedbeds, fens, and open waters. The presence of rare species like the Cetti's warbler highlights the importance of these habitats.