Hi vadeer

i am a full time deer manager and i look after about 20 large woodlands,some are whats called ancient woodlands,some are ssi or as they are known special interest woodlands.in england now we have approx 100,000muntjac deer that have spread all over the best part of england.
They have made a dramatic impact on woodland eco systems,and their biodiversity primarily causing,a change in the woodland architecture by removing the shrub layer.they are associated with the reduction to rare or nationally important flowing plants,ie...bluebells,dogs mercury,native species of orchids,cowslips,devilsbit scabious,honeysuckle,and wood anemone.
The knock oneffect is the reductionof invertebrates species as beetles,butterfly's,this then effects insectivorious birds like blue tits,great tits warblers,wagtails woodpeckers .
Damage caused by muntjac's to shrub and base levels and coppice, also leads to the decline of birds and small mammals which nest at low levels.nightingales,warblers,wrens,hedge sparrows,and the yellow necked mouse,dormice and the bank vole, which in turnhits the survival of predators like tawny owls,barn owls,little owls,and the various birds of prey.
So yes i agree 100% that deer are the main trouble for either browsing the bottom of the wood or subject to what species of deer it is what height they browse at,in any case they can cause a great deal of damage.
Regards,
chinese water deer.