Thunderbird

Discribed as an enormous eagle that can swoop down from the sky and carry away any living creature, no matter what size. The flash when he blinks his eyes makes lightning, and thunder is caused by the beating of his wings. Sometimes he travels with a pair of lightning serpents, which are said to transform themselves into his belt and harpoon. Although they are dangerous, many people believe that seeing or hearing it is a sign of good luck or forthcoming wealth.
Illustrated Dictionary of Mythology by Philip Wilkinson

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