But these sites also mention that it’s bad for the back of an elephant. With some elephants weighing 4,000kg (3), it’s hard to believe that a human weighing 2% of that weight can do any damage to it.
They aren't built for any heavy lifting (4). But I feel like it goes for any animal that they would be able to carry an additional 2% on their backs.
So how come elephants are so vulnerable to carrying stuff on their backs?