Stunning video shows a fire whirl that erupted out of a brush fire near Quail Lake in California. Such "fire devils" are formed when rising hot air from a blaze pulls in smoke and debris and creates a spinning vortex. | CNN

Gob-smacking vision of an incredible natural phenomenon known as a fire whirl, taken on a camera mounted on a Parks and Wildlife fire truck at Watheroo in the Midwest. Senior fire scientist Dr Neil Burrows provides insights into fire whirls and why they form. | Parks and Wildlife Service, Western Australia