The Mens is a biological Site of Special Scientific Interest west of Billingshurst in West Sussex. It is a Nature Conservation Review site, Grade I
This large area of woodland has diverse breeding birds and rich lichen and fungal floras. There are many rare beetles and a fly which is endangered with extinction, Chelostoma curvinervis. All three British species of woodpecker breed on the site, together with other woodland species such as , woodcocks and .
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