Thunderbird tail feather

The tail feather of the Thunderbird was used as a wand core by the American wandmaker Shikoba Wolfe.

Wandlore
Wolfe's wands were powerful but difficult to master and were good for transfiguration work. Wands with Thunderbird tail feather cores, like the birds the feathers were taken from, are able to sense danger and can cast curses on their own. They are known to fire curses pre-emptively when supernatural dangers are present.