The Lake Mead National Recreation Area in Arizona and Nevada began putting microchips in barrel cactuses in 1999 after getting reports of poaching from park visitors.

• 在亚利桑那州和内华达州的湿地公园国家休闲区，在公园参观者中有人偷猎的报道之后，于1999年已开始把微型芯片植入仙人掌。