I decided to quote additional information from the source above, for those curious:

What makes bird poop white?

As birds do not have separate organs for urinating and defecating, all waste is excreted through one single opening called a cloaca. The cloaca serves as an entrance for reproductive purposes, for laying eggs, and as an exit point for excretion of bodily waste. The white sticky paste pooped by birds is uric acid, the equivalent of pee for birds.

What type of bird poops white?

The droppings of all bird species will contain some extent of the white uric acid component, but the rest of the feces may also be colored according to the bird’s diet.

Is bird poop toxic to humans?

Bird poop carries more than 60 different diseases, the majority of which are connected to parasitic infections, including ringworm, chicken mites and bed bugs.

Is it good luck to have a bird poop on you?

The superstition is said to have originated in Russia, where many people believe that the chances of getting pooped on are so low that it must mean that good fortune lies ahead. If a bird poops on your head, then you are truly blessed.

Can bird poop make you blind?

If you get bird poop in your eye, it may cause discomfort and itching, and it’s recommended to rinse it with clean water as soon as you can. Health risks from contact with bird poop are very rare but can have serious consequences. It’s important to seek medical advice if you are concerned.