Bird poop, also known as guano, is often white or gray. However, in some cases, it can appear purple. This is because of a pigment called porphyrin, which is produced by the breakdown of hemoglobin in the bird’s liver. Porphyrin is also found in other animals, such as humans, and it is responsible for the red color of blood. When porphyrin is combined with uric acid, which is also found in bird poop, it can create a purple color.
The amount of porphyrin in bird poop can vary depending on the bird’s diet. Birds that eat a lot of fruits and vegetables tend to have higher levels of porphyrin in their poop, which can make it appear more purple. Birds that eat a lot of insects or meat tend to have lower levels of porphyrin in their poop, which can make it appear more white or gray.
