The proboscis, or what is referred as the butterfly’s straw, is a very important part of its digestive system, as it begins at the very tip. The strong muscles in the butterfly’s head will stretch its first part of the esophagus to sip the nectar from the flower, according to the book “Florida Butterfly Gardening.” The butterfly’s salivary glands will add enzymes, which begin the digestion once the nectar enters the butterfly’s head. The process continues as the nectar is stored in “the crop,” or a sac, in the abdomen once it passes through the thorax. It then moves into the butterfly’s “midgut” where the majority of absorption and digestion takes place before continuing onto the hindgut. The process continues as the hindgut is responsible for getting rid of nitrogen wastes, and excess salts. Uric acid is dumped into the gut to discharge feces, which is in liquid form, at the tip of the abdomen, according to the book “Florida Butterfly Gardening.”