Animals and plants of Fort Spijkerboor
Since the late 1950s Fort Spijkerboor no longer has military status. Nature now runs its course. You can walk on the dike surrounding the fort, with panoramic views of the surrounding polders. In the reed beds of the fort canal you can hear the sedge warbler and reed warbler.

Birds of prey like the marsh harrier, kestrel and owl benefit from the tranquillity at the fort. Surprisingly enough, at Fort Spijkerboor you find enough plants that like sandy soil and that do not appear in the surrounding polders. That is because the fort is covered with dune sand from IJmuiden. With the sand, the seeds of ox tongue and bugloss, also came along.

The fort is also a valuable place for various species of butterfly and bat, including the beard bat, to hibernate.