A forestry economist from the University of Göttingen examined whether forest owners could expect to see feeding damage. The answer was no. Wisents consume large amounts of raspberries, stinging nettles and grasses, but they rarely touch young spruce and beech trees. "The damage will be almost undetectable," says Röhl, especially as the herd will initially be limited to 25 head.
The ruminants will probably even be a little useful, because they keep ecologically valuable areas, along streams, for example, free of undergrowth -- a task currently being performed by forest workers.
Philip Schmitz, 32, a doctoral candidate at the University of Siegen, addressed the issue of how dangerous wisents are for people. To that end, he sent volunteers to approach the animals once a month while he observed from a distance, wearing camouflage and equipped with binoculars and a camera.
The volunteers approached the beasts on foot or with mountain bikes, alone and in groups, accompanied by barking dogs or creeping along the ground like wildlife photographers. "There was never a dangerous incident," says Schmitz. The wisents, which are flight animals, bolted by the time humans had come within 40 meters (around 130 feet) of them.
There has never been an attack in Poland's Bialowieza National Park, near the country's border to Belarus, where about 450 wisents now live in the wild. "You have to have respect for the animals, of course," says Röhl. "If the wisent wants to kill you, he can do it." But the same thing applies to deer and wild boar, he points out.
Another scientist studied wisent feces, in which he found the eggs of dung beetles, which haven't been seen in German forests in centuries. That's because the type of dung beetle native to the area requires large piles of dung, of the sort that no other animal in the forest produces. "The wisent isn't showing up alone," says Röhl.
Will Wisent Attract Tourists? Social scientists interviewed hikers to determine whether they felt drawn to or deterred by wisents. The majority said that a forest with wisents living in it is more exciting than without wisents. But that is precisely the problem.
Many hikers hoping to spot a wisent in the wild are likely to be disappointed. Once they have been successfully released into the wild, the animals will probably be so timid that people will rarely encounter them. If the wisent becomes Bad Berleburg's main attraction, it'll be an invisible one, which isn't good for business.
But local officials promptly came up with a solution. Along the Rothaarsteig hiking trail, there is a viewing enclosure the size of 10 medium-sized Ikea stores in an open area of forest land cleared by the violent windstorm Kyrill, which struck Germany in 2007 and toppled more than 40 million trees. There are six additional wisents living in the enclosure; the animals are curious about people and show themselves readily. Since it opened in September, the "Wisent Wilderness" has attracted more than 10,000 paying visitors. Some of the revenues will benefit the animals' free brethren in the forest.
It is a freedom with limits, however. The wisents of Bad Berleburg will never become a truly wild herd, because their numbers are too small. They only stand a chance of surviving if human beings intervene carefully in their lives.