When a whale blows a rainbow it’s often referred to as a “rainblow,” and they occur only when the lighting is right as a whale exhales at the surface.
Rainblow photos from boats are not rare, but aerial footage of this event is somewhat rare, mostly because the widespread use of drones for whale photography is a fairly new phenomenon.
The accompanying footage of a humpback whale blowing rainbows, captured off Newport Beach, was uploaded on July 6 by YouTube user MGMedia.
Pay close attention at the 40-second mark, because that's when the rainblow is most vibrant.
–Image is a video screen grab