For an upcoming episode of a show called Spy in the Wild, PBS’s Nature used a tiny drone disguised as a hummingbird to capture footage of a swarm of half a billion monarch butterflies as they overwinter in Mexico. The butterflies pay the hummingbird robot little mind:
The current state of the smaller western population of monarchs that overwinter in California is more dire than their eastern counterparts. The western population crashed by 99% in the latest count, reaching a historic low of fewer than 30,000 butterflies for the second year in a row, down from 1.2 million two decades ago.
Both butterfly populations are below the threshold at which government scientists predict the migrations could collapse. Federal scientists estimate there is nearly a 60% chance the monarch’s spectacular, multigenerational migration in the eastern half of the country could completely collapse within the next 20 years.
Monarchs regularly pass through wide swathes of human settlement as they migrate each year from wintering sites in Mexico to summering grounds in the United States and Canada. GFB is the equivalent of a fast-food sign on a highway, advertising rest stops (waystations) to monarchs traveling through the area.
Papalotzin is a project to follow the migration of the monarch butterfly from Canada to Mexico in an ultralight airplane (they call it their big butterfly). They’ve made it as far as NYC so far and are blogging and taking pictures as they go. (via gurgly)
