The color of pigeon droppings has a certain relationship with the food eaten by pigeons. When pigeons eat barley or wheat, their feces are generally light brown. If pigeons eat peas, their feces are darker. Because the pigeon has no gallbladder, its bile is poured out of the intestine, so if the pigeon doesn't eat or eats too little, its feces will be green liquid. Generally, in humid places, pigeon droppings are mostly thick and solid.