Lack of wolves and bears has caused some interesting side effects in Southern England where I live. Namely, the deer population has exploded as their only predator is now the motorcar. It's pretty cool seeing massive flocks of them and the occasional close encounter on my mountain bike; I once fed one some lettuce from a sandwich.

On the other hand, they are eating all the woods, starting with the saplings which is causing real harm to the sustainability of forests.

Predictably, the notion of culling some is very controversial, especially from nature loving people. But the alternative is bringing back the wolves. The wolves will do lots of wolfy things like killing dogs and eating livestock and be equally controversial.

(edit: SPAG)