The cost of deer (or the benefits produced by hunters)

"Last year, hunters killed 7.4 million deer, drivers killed another 1.8 million, but the population of white tail deer still exploded from 29.8 million in 1994 to 32.7 million in 2001. . . . A Utah State University study found that deer vehicle collisions injured about 29,000 drivers and passengers annually and killed an average of 211 people. . . . .estimates that there are 500,000 collisions each year with deer alone, each costing the insurance industry approximately $2,000 per claim or $1 billion annually."