In the Todmorden paper it mentions one of our local landowners near Cross Stone, breeding exotic animals such as Wallabies, Ostriches and Nothern Elk. He also has 2 Muntjac Deer. He does this through his work running Live Animal Capture http://www.liveanimalcapture.co.uk/about-us.html
Muntjac Deer are very destructive. They will eat coppice shoots, natural regeneration, bluebell bulbs, primulas etc. In other parts of the country this non-native deer is causing considerable damage and because the female can be pregnant in any month of the year, populations can rise quickly.
There are Muntjac in South Yorkshire and I believe some near Shibden. Let's hope we don't get any breeding populations in the valley.