The ''Thunderbird'' is a common piece of Native American Mythology, indicative to many of those Cultures. As well as it's commonality, The Thunderbird is also portrayed fairly the same in Native American Art. Shown as a massive Bird (Raptor), they are often so ''big'' as to ''fill the sky''. The coloring of The Thunderbird's feathers vary though, from ''bright Reds'' to ''Multi-colors''. In almost all Native American mythology regarding The Thunderbird, they are regarded as ''Creation'' and ''Protection'' Creatures. They are the Creators of storms, with a single ''flap'' from their wings producing great claps of thunder throughout ''The World''. This action brings rain, and rain feeds crops and brings life. Some Native American Cultures assign The Thunderbird as a Protector, placed in that role by ''The Great Spirit'', to fight off the Evil Spirits of The Underworld. As is common with many of these beliefs, should a ''Nation'' (Native Americans) cease to be or ''lose their Culture'', The Thunderbird's will leave and allow ''Evil'' to roam. Representing Power, many non-Native American Cultures have also adopted the image or symbolism of The Thunderbird as a means of conveying both Speed and Might.