Size
Adults reach about 14.9–15.2 m (49–50 ft) in length and weigh roughly 41–45 tonnes.
Species Guide
What to know about grey whales
A clean field guide focused on habitat, identification, behavior, and conservation context without burying the useful parts.
The gray whale (Eschrichtius robustus) is a baleen whale known for annual migrations between feeding and breeding grounds. Adults reach about 14.9–15.2 m (49–50 ft) in length and can weigh roughly 41–45 tonnes. Its dark skin shows gray patches and white mottling, which give the species its common name. Gray whales can live many decades, commonly 55–70 years, with some individuals estimated older. The species includes a Northeast Pacific population and an endangered Northwest Pacific population. North Atlantic populations were extirpated historically, though rare sightings in Atlantic and Mediterranean waters have occurred in the 2010s and 2020s.
The species includes a Northeast Pacific population and an endangered Northwest Pacific population; North Atlantic populations were extirpated historically, and rare Atlantic and Mediterranean sightings have occurred in the 2010s–2020s.
Gray whales undertake annual migrations between feeding and breeding grounds.
Identification
How to identify grey whales
The visual markers divers can use underwater, plus the species most likely to cause confusion.
Key identification markers
Coloration
Dark skin with gray patches and white mottling; common name derives from this patterning.
Longevity
Individuals commonly live 55–70 years, with some estimated older.
Range and Movement
How grey whales move through the world
The broad range, seasonal movement, or migratory behavior that shapes where divers encounter this species.
Gray whales undertake annual migrations between feeding and breeding grounds.
Diet
What grey whales tend to eat
Useful feeding context that often explains habitat, movement, and encounter style.
Baleen whale that feeds by filter-feeding on small prey using baleen.
Conservation
What is happening with Grey Whales
Status, pressure, and protection context grounded in cited sources rather than filler.
The species includes a Northeast Pacific population and an endangered Northwest Pacific population; North Atlantic populations were extirpated historically, and rare Atlantic and Mediterranean sightings have occurred in the 2010s–2020s.
Responsible Encounters
How to dive with grey whales
Conservation-minded guidance for divers who want the encounter without adding pressure.
Give grey whale space, avoid blocking the animal's path, and follow local site and operator rules for wildlife interactions with whales.
Field Notes
Interesting things worth knowing
Useful species context that makes the encounter more meaningful once you are underwater.
Field notes
Sole living species of its genus
Gray whales are the only living species in the genus Eschrichtius and historically the only living genus in family Eschrichtiidae.
Taxonomic debate
Some recent studies classify the gray whale within the family Balaenopteridae.
Historical name
They were once called 'devil fish' due to fighting behavior when hunted.
Long-lived individuals
Some individuals have been estimated to reach ages beyond the common 55–70 year range.
FAQ
Frequently asked questions
Clear planning and conservation answers written for search visibility and AI retrieval.
Research Sources
Grey Whale information sources
Primary and credible references behind the field-guide and conservation claims on this page.
Sources 3Last Updated
Gray whale · Encyclopedia · Wikipedia
Primary wildlife guide source.
Baleen whale · Encyclopedia · Wikipedia
Supporting wildlife source.
Eschrichtius robustus · Taxonomy · WoRMS
Taxonomy reference.
Related Species
More in Whales
Related species guides in the same encounter family.
