The ten heaviest living animals are all whales, ranked by average adult body mass in metric tonnes, from the 110-tonne blue whale down to the gray whale.
The Blue whale is the heaviest animal alive, averaging about 110 tonnes as an adult; the heaviest confirmed specimen weighed 190 tonnes. Ranked by average adult mass, the North Pacific right whale (about 60 tonnes) is second and the Southern right whale (about 58 tonnes) third. All ten are whales; figures are metric tonnes from the compiled table checked in October 2026.
Every one of the ten heaviest animals alive today is a whale. Water supports a body that would be impossible on land: the African bush elephant, the heaviest land animal, averages about 6 tonnes and would not come close to this list. We rank species by average adult body mass, in metric tonnes, rather than by single record specimens. Almost no large whale has ever been weighed whole, so most 'maximum' weights are estimates from length or from whales weighed in pieces at whaling stations. Averages from one compiled table give a fairer like-for-like comparison, and the upper estimates are shown alongside for context.
Blue whales average about 110 tonnes as adults, nearly twice the next species on the list. The heaviest confirmed specimen, a 27.6-metre female caught in the Southern Ocean in 1947, was recorded at 190 tonnes; longer individuals were measured but never weighed.
A short, thickset right whale that averages about 60 tonnes, making it the second-heaviest living animal on average despite being far shorter than the rorquals. It is extremely rare: the IUCN lists the species as endangered and its Northeast Pacific population as critically endangered.
The Southern Hemisphere's right whale averages about 58 tonnes. Like the other right whales it is identified by callosities, rough patches of hardened skin on the head that differ from one whale to the next.
At about 21 metres on average, the fin whale is much longer than the right whales, but its slender build keeps its average mass to about 57 tonnes. It is one of the fastest cetaceans, able to sustain 37 to 41 km/h.
This heavy-bodied Arctic whale averages about 54.5 tonnes. Bowheads are thought to be the longest-lived mammals, with some individuals estimated at more than 200 years old.
This right whale averages about 54 tonnes and is slightly smaller on average than its North Pacific relative. It is among the most endangered whales in the world and is protected under the US Endangered Species Act.
The largest toothed whale and largest toothed predator averages about 31 tonnes across adults, with males far bigger than females. Its clicks, measured at source levels up to 236 decibels underwater, are the loudest sounds made by any animal.
Humpbacks average about 29 tonnes. Their genus name means 'giant wing', a reference to the very long front flippers that set them apart from other large whales.
A slim rorqual averaging about 22.5 tonnes. Its name comes from the Norwegian seihval, 'pollock whale', because it appeared off Norway each year at the same time as the pollock.
The lightest whale in the top 10 still averages about 19.5 tonnes, around three times the average African bush elephant. Gray whales feed mainly on the seafloor, sieving small crustaceans out of mouthfuls of sediment.
| # | Name | Scientific name | Avg length (m) | Upper weight estimate (t) | Group |
|---|---|---|---|---|---|
| 1 | Blue whale | Balaenoptera musculus | 24 | 190 | Baleen whale (rorqual) |
| 2 | North Pacific right whale | Eubalaena japonica | 15.5 | 120 | Baleen whale (right whale) |
| 3 | Southern right whale | Eubalaena australis | 15.25 | 110 | Baleen whale (right whale) |
| 4 | Fin whale | Balaenoptera physalus | 21 | 120 | Baleen whale (rorqual) |
| 5 | Bowhead whale | Balaena mysticetus | 15 | 120 | Baleen whale (right whale family) |
| 6 | North Atlantic right whale | Eubalaena glacialis | 15 | 110 | Baleen whale (right whale) |
| 7 | Sperm whale | Physeter macrocephalus | 13.25 | 80 | Toothed whale |
| 8 | Humpback whale | Megaptera novaeangliae | 13.5 | 48 | Baleen whale (rorqual) |
| 9 | Sei whale | Balaenoptera borealis | 14.8 | 45 | Baleen whale (rorqual) |
| 10 | Gray whale | Eschrichtius robustus | 13.5 | 45 | Baleen whale |
Ranking metric: average adult body mass of the species in metric tonnes (1 tonne = 1,000 kg), highest first. All ten averages come from a single table, 'Heaviest living animals' on Wikipedia's 'Largest and heaviest animals' page (checked 18 October 2026), which takes its averages from the International Whaling Commission's 'Lives of Whales' summary; the order here matches that table exactly. Only living species are included, one entry per species. Context columns: average total length (same table) and 'Upper weight estimate', the table's maximum-mass column. These upper values are not all on the same footing: the blue whale's 190 tonnes is the heaviest confirmed specimen (a female caught in 1947, as recorded by Guinness World Records), while the other species' upper values are published estimates from field guides and length-based formulas rather than whales weighed on a scale, so they are shown for context only and not used for ranking. Large whales are weighed in parts if at all (Lockyer, 1976), so all figures are approximate. No short tons or pounds are mixed in. Bryde's whale (up to about 40 tonnes estimated, with a much lower average) and other rorquals fall below the gray whale on the average-mass basis.
The blue whale. Adults average about 110 tonnes, and the heaviest confirmed specimen, a 27.6-metre female caught in the Southern Ocean in 1947, was recorded at 190 tonnes. It is also the heaviest animal known to have lived; Guinness World Records lists it jointly with the extinct whale Perucetus, whose weight is only estimated.
Because almost no large whale has been weighed whole. Record figures for most species are estimates from body length or from carcasses weighed in pieces, and they come from different sources. Average adult mass from a single compiled table compares species on the same footing.
Right whales are short but very bulky with thick blubber, while fin whales are long and slender. On average the North Pacific and Southern right whales (about 60 and 58 tonnes) edge out the fin whale (about 57 tonnes), even though the fin whale averages around 21 metres long against about 15 metres for the right whales.
The African bush elephant, which averages about 6 tonnes. Even the gray whale, the lightest species on this list, averages about 19.5 tonnes.
More like this: all Animals & Nature rankings · browse every topic