As gates close against migrants entering Europe Tom Heap is in Croatia to examine the wildlife impact of the continent's new borders.

Red deer have been found dying on the razor wire and the vulnerable local population of lynx is now split between Slovenia and Croatia. With a shrunken gene pool the lynx could soon be lost from the region.

From the Austrian Alps, south through the Balkans to Greece the mountains provide a vital habitat for large carnivores like bear and wolf. As new fences rise across the region Europe's peak predators face a bleak future.

Producer: Alasdair Cross.