or blood. As the wolf's power of scent is so great, a mere touch of human skin on the trap will result in the wolf vacating the area. Wolves may also dig up or spring the traps. The traps would typically be set in fours around a bait and strongly fastened to concealed logs, and covered in moss, chaff, cotton or sand for camouflage. Sometimes, the trap and the bait would be placed in a pool of water, thus leaving no other point of access for the wolf to take. Reactions Livestock and crop damage Opponents have argued that at least in North America, wolves contribute little to overall livestock losses. In 2005 0.11% of all cattle losses were due to wolves. In states with wolf populations, they were responsible for an average of 2.5% of predation on sheep. Jim Dutcher, a filmmaker who raised a captive wolf pack, observed that the wolves were very reluctant to try meat that they had not previously eaten or seen another wolf eat before, possibly explaining why livestock depredation is unlikely except in cases of desperation. In Wyoming, Idaho and Montana, wolf predation accounts for 1% of total sheep deaths. Wolf hunting proponents have drawn attention to the fact that wolves will on occasion commit acts of surplus killing when within the confines of human-made livestock shelters. Rare incidents of surplus killing by wolves in Minnesota are reported to leave up to 35 sheep killed and injured in flocks and losses of 50 to 200 birds in turkey flocks. In spite of the low percentage of attacks on livestock in Minnesota, farms in wolf territories and environments may become more susceptible to depredation under certain conditions. These conditions include larger farm size, increased numbers of cattle, an increased distance from human management, and improper disposal of livestock carcasses. While loss of livestock by wolves makes up only a small percentage of total losses in North America, surveys in Eurasia show some instances where wolf predation was frequent. In some areas of the former Soviet Union, wolves cause serious damage to watermelon plantations. Wolves will usually only take ripe melons after giving test bites, which can render even unripe fruits worthless for future consumption. Sometimes, up to 20% of the total watermelon crop can be destroyed on one raid. Wolves and game herds Wolf hunting opponents have argued that wolves serve vital functions in