Mesoplodon mirus

True's Beaked Whale has never been identified at sea, so nothing is known about its behavior; the lack of confirmed sightings may simply reflect the difficulty of identification at sea. Scrapes and scars on the back and sides indicate that males fight with each other. Deep dives may be possible.

Trudeau's beaked whale is one of the rare whale species with sightings. Three Trudeau's beaked whales were seen moving at a depth of about 600 fathoms off the coast of North Carolina. In this sighting, the three beaked whales surfaced for about 10 to 12 seconds each time, first with their beaks touching the sea surface, and then with their heads poking out of the water to the level of their eyes. Its jet is in the shape of a low column, with a height close to the length of its head. After the jet, it will arch its back and glide under the sea, but will not raise its tail fin. One of the three beaked whales was smaller, and witnesses speculated that the group may consist of two adult female whales and a larger calf or juvenile whale. Little is known about its reproductive situation. There was a record of a female whale stranded with a calf about 3.4 meters long. The female whale was pregnant and still in the lactation period. It is generally believed that Chu's beaked whale mainly feeds on squid.

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Until a specimen was found off the Indian Ocean coast of South Africa in 1959, it was thought that Trudeau's beaked whales were confined to the North Atlantic. Since then, strandings have been reported in South Africa, Australia, and one unconfirmed record in New Zealand. These cases may represent geographically isolated populations, or a distribution much wider than the few records. Most strandings occur in the western North Atlantic, but there are some records in the eastern North Atlantic: primarily off the west coast of Ireland and in the United Kingdom, France, and the Canary Islands. The Gulf Stream may be involved.

Females and calves may be difficult to identify unless stranded for further detailed examination. There are probably two types of True's beaked whales: the best-known type lives in the North Atlantic; the other type occurs in parts of the Southern Hemisphere. There are slight differences in the skull and body coloration between the two. Information on True's beaked whales is available from 40 specimens, 75% of which were found in the North Atlantic. In 1913, American biologist Frederick True named it "mirus", which means "wonderful". Newborns are 2.3 meters tall, and adults are 4.9-5.3 meters tall.
The southern hemisphere population has a white jaw, a moderately sized beak, a slightly raised forehead, a slightly sunken blowhole, abrasions and scars on the back and sides, a dark gray or blue-gray back, a curved dorsal fin (with individual differences), a concave rear edge, a white or light blue-gray rear 1/3 of the body, a narrow tail with a ridge on the