1. African Elephant Average Mass (lb): 18,500 (8500 kg) Maximum Mass (lb): 27,000 (13000 kg) Average Length (ft): 21.85 The heaviest terrestrial animals found on earth can be measured using a variety of methods. It could be defined as the largest by volume, mass, height, or length. The following is a list of top ten heaviest land animals of the world. The walrus is included as it spends much of its time on land. 2. Asian Elephant Average Mass (lb): 8,750 (4200 kg) Maximum Mass (lb): 11,000 (5200 kg) Average Length (ft): 19.5 3. White Rhinoceros Average Mass (lb): 5,000 (2350 kg) Maximum Mass (lb): 7,920 (3850 kg) Average Length (ft): 12.5 4. Hippopotamus Average Mass (lb): 5,250 (2500 kg) Maximum Mass (lb): 7,100 (3400 kg) Average Length (ft): 11 5. Gaur Average Mass (lb): 3,300 (1600 kg) Maximum Mass (lb): Unknown Average Length (ft): 9.8 6. Giraffe Average Mass (lb): 3,000 (1400 kg) Maximum Mass (lb): 4,400 (2100 kg) Average Length (ft): 15.4 7. Walrus Average Mass (lb): 2,645 (1200