True's beaked whale

Mesoplodon mirus

Also known as: True’s North Atlantic Beaked Whale

LCLeast Concern

True's beaked whale is a deep-diving, rarely seen whale whose quiet surfacing and offshore habitat keep much of its life hidden. It has a small head, short beak, and the narrow body typical of close relatives. Most knowledge comes from strandings and scattered encounters, so records mark confirmed evidence rather than abundance or a complete range.

US Range

IUCN Red List status

  1. LC
  2. NT
  3. VU
  4. EN
  5. CR
  6. EW
  7. EX

LC – Least Concern

Widespread and abundant; not at risk.

Best encounter

Where and when to see a True's beaked whale

Your best chance: North Carolina.

Where
North CarolinaNC

Life history

The True's beaked whale (2100 kg4629.7 lb) is a carnivore that bears about 1 young per litter.

Reproduction

Litter size
1youngaverage

Diet composition

Carnivore

By foraging composition: 80% invertebrates, 20% fish.

  • Invertebrates80%
  • Fish20%

Most active around the clock.

Typical values for the species, not local measurements.

Commonly confused with

Animals people sometimes mistake for the true's beaked whale, and how to tell them apart.

Why identification is difficult

True’s beaked whale has a dark upper body, pale underside, and a small curved back fin set far behind the midpoint. Adult males develop two visible teeth near the lower jaw’s tip. Brief views often don’t reveal enough detail to separate similar species.

Long dives into dark water

It lives beyond the continental shelf, where steep underwater slopes support squid and deep-water fish. The whale makes long foraging dives and spends little time at the surface. Small groups rise quietly without obvious blows.

Clicks locate prey beyond daylight, while social calls keep animals in contact. Mothers invest heavily in a single calf that depends on milk and close guidance.

Two ocean regions

Verified records occur in the North Atlantic and parts of the Southern Hemisphere. United States reports are scarce and often linked to strandings or offshore surveys. This reflects detection difficulty and doesn’t show abundance.

Risks far offshore

The IUCN lists True’s beaked whale as Least Concern. Population trends remain uncertain. Underwater noise, fishing gear, debris, and prey changes can affect whales far from shore. Accurate stranding work provides valuable evidence.

Data & sources

The data and visualizations on this page draw on these open sources:

  • GBIFCC-BY 4.0occurrence records behind the range map, elevation, and record counts
  • PhyloPicCC0 / CC-BY per itemthe to-scale silhouettesAndrew A. Farke (human silhouette, CC-BY 3.0)
  • AnAge (HAGR)CC-BY 3.0longevity, maturity, and gestation figures
  • IUCN Red Listattributed factthe global conservation status
  • Amniote Life-History DatabaseCC0 · public domainreproduction figures
  • EltonTraitsCC0 · public domaindiet and foraging-activity data