As the war against rhino poaching in Africa intensifies, conservationists are forced to turn to more unique methods and innovative technologies to save the last of these endangered species. One approach is to insert a GPS microchip into a drilled hole in the horn. The chip has four alarm sensors that trip should poachers try to remove the horn. Another more proactive tactic is to inject an indelible dye and toxin mix into the rhino's horn, which turns it pink and renders it unusable for human consumption for at least 4 years.