Following is the list of Top 10 Heaviest Living Mammals as per Consensus Document on the Biology of Populus:
| Rank | Animal | Average Mass | Maximum Mass | Average Total Length |
| 1 | Blue Whale | 110,000 kg | 190,000 kg | 25.5m |
| 2 | North Pacific Right Whale | 60,000 kg | 120,000kg | 15.0m |
| 3 | Southern Right Whale | 58,000 kg | 110,000kg | 15.25m |
| 4 | Fin Whale | 57,000 kg | 120,000kg | 20.6m |
| 5 | North Atlantic Right Whale | 55,000 kg | 100,000kg | 15m |
| 6 | Bowhead Whale | 54,500 kg | 120,000kg | 15m |
| 7 | Sperm Whale | 31,250 kg | 57,000kg | 13.25m |
| 8 | Humpback Whale | 29,000 kg | 48,000kg | 13.5m |
| 9 | Sei Whale | 22,500 kg | 45,000kg | 14.8m |
| 10 | Gray Whale | 19,500 kg | 45,000kg | 13.5m |
