How do you get guano in my tribe

go to the dark spot of the ocean around your island and click on a seagull. if it flies toward your island, follow it and hope it poops on your island, if so, click on it. you will receive 2 experience and it will added to your inventory under Raw Materials. if it land in the water, it is impossible to get, even when falling from the bird. Also, if the bird does not fly toward your island, it goes out of bounds and never returns. THIS DOES NOT WORK ON THE LAND-MULTICOLORED BIRDS. OR BUTTERFLIES, BUT I ASSUME YOU KNOW THAT ALREADY.