Michigan is bracing for an invasion of butterflies.

They arrive every spring, more than 150 species of them fluttering around The Great Lakes State. But experts are saying this year there will likely be fewer of them than ever before.

Nationwide, we’ve seen a decline of nearly 25 percent in the butterfly population in just 20 years.

A researcher at Michigan State University tells Bridge Michigan the dwindling numbers are likely due to widespread pesticide use and habitat loss.

The loss of butterflies could represent a trend that suggests a looming extinction crisis throughout the insect world, as well as a problem with the ecosystem.