Monarch caterpillar (Danaus plexippus) Published May 18, 2016 at 1348 × 900 Fith instar caterpillar on milkweed. Credit: Yalakom Click to print (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Pinterest (Opens in new window)Like this:Like Loading...