Kent Wildlife Trust and Wildwood Trust said the animals act like ecosystem engineers, naturally reshaping and restoring woodland.
Through grazing, felling trees, eating bark and taking dust baths, bison promote woodland regeneration and create new spaces for other wildlife.
Paul Hadaway, from Kent Wildlife Trust, said herds created “habitat complexity through their natural behaviour”.
Toby Mounsey-Heysham, from Castletown Estate which owns the land, added the project was about “allowing natural processes to do the work” and “creating a living landscape”.