Adult Spinetail Mobula (Mobula japanica) massing in huge schools in the upper Gulf of California (Sea of Cortez), Mexico

spinetail mobula ray japanica gulf of california sea cortez elasmobranch cartilaginous fish mexico adult spinetail mobula mobula japanica massing huge schools mating upper gulf of california whip like tail sting diagnostic marine group schooling school mate swimming swim