Cloudless Sulfur, also known as Phoebis sennae or Cloudless Giant Sulphur, is a yellow butterfly species found in the Americas. As with many creatures, there are several synonyms used to refer to this species of butterfly. Some of these synonyms include Yellow Angled-Sulphur, Yellow Giant-Sulphur, Yellow Giant Sulphur, Orange Giant-Sulphur, Orange Giant Sulphur, and Sennae Sulphur. The Cloudless Sulfur is distinctive for its yellow wings with black borders and spots, making it easy to spot in the wild. It is a popular species with butterfly enthusiasts, who often raise them in captivity and release them as adults.