In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

In Hawaiian myth, the magic dogs Ku and Poki sometimes appear in this form, and Ngai, chief god of the Masai, manifests as a red one when he is angry and as a black one when he is happy. The Tuatha D Danann traveled to Ireland on a large one, and Zeus used one to hide from Hera while seducing Io. In Norse myth they were spun in Fensalir by the goddess Frigga. The woman Nephele was created from one in order to satisfy Ixion's lust for Hera, and became the mother of the centaurs. FTP, name these fluffy atmospheric phenomena.
Science