"After chasing them around the enclosure, facility personnel grab primates by their tails, then pull on their tails to remove the primates from the chain link they are hanging onto. This maneuver can result in trauma," a U.S. Department of Agriculture (USDA) report states. "After they are grabbed, and captured, the primates are then put into a pole net, sometimes with another captured monkey. On occasion, it was observed on the video, that these pole nets were lowered by the personnel which resulted in the captured primates hitting and dragging along the concrete ground."
This treatment can cause serious damage. "[T]here was the real danger of dislocating the vertebrae in the tails and even breaking off portions of the tails," Nedim Buyukmihci, professor of veterinary medicine at the University of California-Davis, told PETA. "Long-tailed macaques do not have prehensile tails, hence the tails cannot withstand the kind of trauma being inflicted on them."