Baleen whales

Cetaceans like whales, dolphins, and porpoises form interspecies associations for predator deterrence, predator avoidance, foraging, and socialization. These behaviors can involve thousands in a pod, with practices like coordinated feeding and shifts for vigilance against predators. Such alliances may also have aspects like alloparenting and possible interspecies communication, showcasing complex social dynamics and cooperative strategies among different species within the marine environment.

Vibrissae, or whiskers, are found in most mammals, including cetaceans like dolphins, whales, and porpoises. These were likely inherited from terrestrial ancestors, serving as sensory organs during these species’ evolution from land to water. While in many cetaceans, whiskers disappear as they mature, leaving behind small cavities termed ‘vibrissal crypts’, certain species, such as the Amazon river dolphin, retain them, helping in food detection and possibly electroreception.