【ZOOKEEPER另类】BTK---Dennis Lynn Rader---Span of killings:1974-1991---Number of victims:10;【ZOOKEEPER另类】The Backpacker Killer---Ivan Milat---Span of killings:1989-1994---Number of victims:7;【ZOOKEEPER另类】Johann Unterweger---Span of killings:1976-1992---Number of victims:10-11