Text and photos by Keegan Curry, SPP Butterfly Program Coordinator

Washington’s winter was exceptionally cold and wet this year, posing unique challenges for SPP’s Taylor’s checkerspot rearing program. After a deceptive warm spell, the butterfly technicians at Mission Creek Corrections Center for Women (MCCCW) brought the caterpillars out of winter diapause only to find that spring was yet to come! Temperatures plummeted and constant rainfall postponed the larval release that typically follows within a few weeks of wake up. But in spite of this delay, technicians patiently fed and nurtured over 3,000 hungry caterpillars as we waited for weather to improve.

(Left to right) Jessica Stevens, Cynthia Fetterly, and Susan Christopher rest after a long day of counting, sorting, and feeding caterpillars. The shelves behind them house over 3,000 Taylor’s checkerspot larvae!

Everyone (including the caterpillars) thought it was time for spring. But winter returned with additional snowfall at the MCCCW rearing facility.

WDFW biologist Mary Linders carefully releases Taylor’s checkerspot larvae onto their host plant.

When environmental conditions finally improved, SPP transported the caterpillars to field sites for release. Our partners at Washington Department of Fish and Wildlife (WDFW) were happy to see healthy and active larvae crawling about in the sunny weather. Sadly, the women from MCCCW were unable to attend the release this year, but their efforts in the lab were recognized as critical in transitioning these larvae from captivity to the wild.

A curious Taylor’s checkerspot larva explores its new habitat.

WDFW biologist Mary Linders explains larval release procedures to volunteers.

A volunteer releases one final cup of Taylor’s checkerspot caterpillars.

This larva had already traveled over a yard from its release site!

In all, about 2,500 Taylor’s checkerspot larvae made it out to Salish lowland prairie reintroduction sites where they continue to support the recovery of this endangered species and their habitat.

Clouds break over the prairie as Taylor’s checkerspot larvae adjust to their new home.