Beluga whales, also known as white whales, are a species of toothed whale that belongs to the family Monodontidae. The scientific name for beluga whales is Delphinapterus leucas. They are easily recognizable by their distinctive white color and bulbous forehead, called a melon. Beluga whales are found primarily in the Arctic Ocean and its nearby seas, including the Atlantic and Pacific Oceans.

Beluga whales are highly social animals that live in pods and communicate with each other using a complex system of clicks, whistles, and body movements. They are also known for their intelligence and have been trained to perform various tasks in captivity. Beluga whales feed on a variety of prey, including fish and invertebrates, and are capable of diving to depths of over 2,000 feet in search of food.

Beluga whales are considered a species of concern due to threats such as habitat loss, pollution, and climate change. They are also hunted by indigenous communities in the Arctic for subsistence purposes. Conservation efforts are underway to protect beluga whales and their habitats, including the designation of protected areas and the implementation of management measures to reduce threats.

I'm sorry for any confusion, but the term "Valar" is not a medical term or concept. It is actually a fictional concept from J.R.R. Tolkien's Middle-earth legendarium, referring to a group of powerful beings in his fantasy universe. They are often described as being similar to angels or demigods in other mythologies. Therefore, there is no medical definition for "Valar."

'Balaenoptera physalus' er en medlem av hvalfamilien og kallas også for finnehval. Det er den andre største art av hval i verden etter blåhvalen, og kan veie opp til 74 tonn og måle opp til 27 meter i lengde. Finnehvalen har en distinktiv finne på bakkroppen, som er større enn hos noen andre hvaler, og dette er derfor blitt navnet på arten i mange språk. Den lever i alle verdens have, men foretrekker kalde vann og er almindeligst å finne i Arktis og Antarktis. Finnehvalen livnrer seg av plankton som den filterer ut av vannet ved hjelp av sine baleenplater. Den er en populær art for hvalsafari, men er likevel listet som akutt truet på IUCN rødtliste på grunn av historisk overutnytting og fortsatt trussel fra kollisjoner med fartøy og støy fra sonar.