Cloudless Sulfur Larva (Phoebis sennae)
On Partridge pea (Chamaecrista fasciculata), one of its known host plants. Its host plants (Senna, Cassia, and Chamaecrista sp.) are all poisonous species. So larvae like this one that (pretty much exclusively) feed on them accumulate a toxic deterrent!
Even Jason sees how I think they are somewhat camouflaging themselves as the "peas" (despite the aposematic coloration)! Look at the pods in the background in comparison!
At a meadowy powerline cut near a wetland/lake re-regulation reservoir.
The cloudless sulphur or cloudless giant sulphur is a midsized butterfly in the family Pieridae found in the New World. There are several similar species such as the yellow angled-sulphur, which has angled wings, or other sulphurs, which are much smaller.