A total of 160 monarchs across Mexico’s six butterfly sanctuaries have been tagged with new transmitters that will provide the most detailed look to date at the first leg of the the insects' migration back north.
Adriana Avelina Ruíz Márquez uses fake eyelash glue to attach a tiny transmitter to the thorax, just behind the head, of the monarch butterfly.
The monarch, which weighs about half a gram, easily c… [+6530 chars]
