Animalia > Chordata > Mammalia > Cetacea > Eschrichtiidae > Eschrichtius > Eschrichtius robustus

Eschrichtius robustus (Gray Whale; Western Gray Whale)

Synonyms: Balaenoptera robusta; Eschrichtius gibbosus; Eschrichtius glaucus
Language: Spanish

Wikipedia Abstract

The gray whale (Eschrichtius robustus), also known as the grey whale, gray back whale, Pacific gray whale, or California gray whale is a baleen whale that migrates between feeding and breeding grounds yearly. It reaches a length of 14.9 meters (49 ft), a weight of 36 tonnes (40 short tons), and lives between 55 and 70 years. The common name of the whale comes from the gray patches and white mottling on its dark skin. Gray whales were once called devil fish because of their fighting behavior when hunted. The gray whale is the sole living species in the genus Eschrichtius, which in turn is the sole living genus in the family Eschrichtiidae. This mammal descended from filter-feeding whales that appeared at the beginning of the Oligocene, over 30 million years ago.
View Wikipedia Record: Eschrichtius robustus

EDGE Analysis

Uniqueness Scale: Similiar (0) 
 Unique (100)
Uniqueness & Vulnerability Scale: Similiar & Secure (0) 
 Unique & Vulnerable (100)
ED Score: 22.87
EDGE Score: 3.17


Adult Weight [1]  31.416 tons (28,500.00 kg)
Birth Weight [1]  1,102.317 lbs (500.00 kg)
Diet [2]  Carnivore (Invertebrates), Piscivore
Diet - Fish [2]  10 %
Diet - Invertibrates [2]  90 %
Forages - Marine [2]  100 %
Emoji [3]  spouting whale
Gestation [1]  1 year 1 month
Litter Size [1]  1
Litters / Year [1]  1
Maximum Longevity [1]  77 years
Migration [4]  Interoceanic
Weaning [1]  6 months
Female Maturity [1]  8 years
Male Maturity [1]  8 years

Protected Areas

Prey / Diet

Prey / Diet Overlap


Homo sapiens (man)[6]
Orcinus orca (Killer Whale)[6]
Somniosus pacificus (Pacific Sleeper Shark)[6]


Range Map


East Pacific; Indo-West Pacific;

External References



Attributes / relations provided by
1de Magalhaes, J. P., and Costa, J. (2009) A database of vertebrate longevity records and their relation to other life-history traits. Journal of Evolutionary Biology 22(8):1770-1774
2Hamish Wilman, Jonathan Belmaker, Jennifer Simpson, Carolina de la Rosa, Marcelo M. Rivadeneira, and Walter Jetz. 2014. EltonTraits 1.0: Species-level foraging attributes of the world's birds and mammals. Ecology 95:2027
3Emoji by Twitter is licensed under CC BY 4.0
4Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. 2006. The Animal Diversity Web (online). Accessed February 01, 2010 at
5THE FOOD DIET CONTENT OF THE GRAY WHALE ESCHRICHTIUS ROBUSTUS IN MECHIGMENSKY BAY, WESTERN BERING SEA, Lyudmila L. Budnikova, Sergey A. Blokhin, Dennis I. Litovka, Internal Whaling Commission, SC65a Meeting, BRG13, 2013
6Jorrit H. Poelen, James D. Simons and Chris J. Mungall. (2014). Global Biotic Interactions: An open infrastructure to share and analyze species-interaction datasets. Ecological Informatics.
7Food Web Relationships of Northern Puget Sound and the Strait of Juan de Fuca : a Synthesis of the Available Knowledge, Charles A. Simenstad, Bruce S. Miller, Carl F. Nyblade, Kathleen Thornburgh, and Lewis J. Bledsoe, EPA-600 7-29-259 September 1979
8Szoboszlai AI, Thayer JA, Wood SA, Sydeman WJ, Koehn LE (2015) Forage species in predator diets: synthesis of data from the California Current. Ecological Informatics 29(1): 45-56. Szoboszlai AI, Thayer JA, Wood SA, Sydeman WJ, Koehn LE (2015) Data from: Forage species in predator diets: synthesis of data from the California Current. Dryad Digital Repository.
9Gibson, D. I., Bray, R. A., & Harris, E. A. (Compilers) (2005). Host-Parasite Database of the Natural History Museum, London
Protected Areas provided by Biological Inventories of the World's Protected Areas in cooperation between the Information Center for the Environment at the University of California, Davis and numerous collaborators.
Specially protected natural territories of the Russian Federation, Ministry of Natural Resources and Environment of the Russian Federation
Images provided by Wikimedia Commons licensed under a Creative Commons License
Abstract provided by DBpedia licensed under a Creative Commons License