Bird poop in general are not really harmful for plants but once the droppings land straight on still fragile and young tissues, these might burn them. This damage is due to the droppings’ high mineral concentration. However, it is a rather minor effect in general. Mature plant parts and leaves are often not harmed in any way. Apart from this small imperfection, bird poop is usually very beneficial for plants and are actually one of the main sources of natural fertilizer. Bird poop contains different minerals including magnesium, potassium, calcium, nitrogen, and phosphorus. The exact amount of these minerals will vary depending on the specific bird species and its diet.