 Manta and devil rays, mobulates, are filter feeding elasmabranchs that aggregate in large numbers for various reasons, such as socializing, feeding, courtship and mating, predation avoidance, cleaning, and thermoregulation. These aggregations can be threatened by fisheries, tourism, and climate change, and require further research into the drivers and environmental factors that trigger them. This article was authored by Marta de Palacios, Marta de Palacios, Marta de Palacios, and others.