Woodchester mansion - an unfinished 19th century mansion house within the park - supports a very important breeding colony of greater horseshoe bats, which feed in the surrounding cattle pasture.
A long-term study of the bat colony was set up in late 1950s and continues today.
 The valley is also of outstanding invertebrate interest for butterflies, moths, dragonflies and some rare snails.
There is abundant bird-life and breeding birds include sparrowhawk, green woodpecker and tawny owl.
The lakes on the site are also used by overwintering wildfowl, and breeding species such as little grebe and mallard.
There are also colonies of the yellow-necked mouse .
Additionally, Woodchester Park is notable as the site of the Animal and Plant Health Agency long term study into the epidemiology of bovine tuberculosis in badgers .

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Woodchester mansion - an unfinished 19th century mansion house within the park - supports a very important breeding colony of greater horseshoe bats, which feed in the surrounding cattle pasture. A long-term study of the bat colony was set up in late 1950s and continues today.  The valley is also of outstanding invertebrate interest for butterflies, moths, dragonflies and some rare snails. There is abundant bird-life and breeding birds include sparrowhawk, green woodpecker and tawny owl. The lakes on the site are also used by overwintering wildfowl, and breeding species such as little grebe and mallard. There are also colonies of the yellow-necked mouse . Additionally, Woodchester Park is notable as the site of the Animal and Plant Health Agency long term study into the epidemiology of bovine tuberculosis in badgers .
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Woodchester Park SSSI