Citing constitutional flaws, Gov. Jim Geringer vetoed a bill Friday that would have put a $1,000 bounty on the head of any wolf lawfully killed outside Yellowstone National Park.

"I fear for the citizen who in good faith would comply with the new law by killing a wolf only to be dealt a heavy blow through federal prosecution under the Endangered Species Act," Geringer said.He added, however, that he supports the "underlying sentiment" of the bill.

Wolves were reintroduced to Yellowstone and central Idaho last month after being wiped out in those areas more than 60 years ago.

The federal recovery plan allows the endangered animals to be slain outside the park only if they are caught killing livestock. Ranchers oppose the reintroduction plan, saying the wolves are threatening their livelihood.