Caterpillars shed their skin several times as they grow, and in the final stage of metamorphosis, they form their pupa ...

"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 ...

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

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 ...