Ilvermorny is divided into four houses: Thunderbird, Horned Serpent, Pukwudgie, and Wampus, each said to represent a different part of the ideal wizard. The names were chosen by Isolt Sayre and her family after their favourite magical creatures. Chadwick being "intelligent but also temperamental" chose the Thunderbird, his brother Webster "argumentative and fiercely loyal" chose the Wampus. Isolt herself was a Parselmouth and chose the Horned Serpent, and her No-Maj (Muggle or non-magical) husband James Steward picked the Pukwudgie, since Isolt's stories about one made him laugh. Ilvermorny has no house colours, but every student wears blue and cranberry robes, fastened by a gold Gordian Knot.