• Science
• B1

Tracking the Monarch Migration by Smartphone

The U.S. Fish and Wildlife Service is attaching tiny solar-powered Bluetooth tags to monarch butterflies. In autumn 2026, the butterflies are flying south to their wintering habitats. Bluetooth is a short-range wireless technology that lets electronic devices send signals to each other. Each transmitter weighs 6 milligrams and runs at 2.4 GHz. This is a common wireless radio frequency band.…

Rewritten with AI from facts reported by US Fish and Wildlife Service. Read the original for the full report.