Monarch Caterpillar
Danaus plexippus

f25 @ 1/400s, ISO:2000, Nikon D3S w 105mm macro

"Monarch Caterpillar," Wikipedia, the free encyclopedia. The third-instar larva has more distinct bands and the two pairs of tentacles become longer. Legs on the thorax differentiate into a smaller pair near the head and larger pairs further back. Third-instar larvae usually feed using a cutting motion on leaf edges. The third instar is usually between 1 and 1.5 cm long.
Francis A. Crane Wildlife Management Area, East Falmouth, Massachusetts