"This handsome butterfly is now rare ... Biologists waited until the caterpillars were old enough that they were nearly ready to begin metamorphosis, then they placed them onto the plant to ...

Biologists deposited caterpillars of the rare frosted elfin butterfly on its host plant ... old enough that they were nearly ready to begin metamorphosis, then they placed them onto the plant ...

The Florida Fish and Wildlife Conservation Commission announced April 30 that biologists had released caterpillars of the ...