Megalodon's Little Known Weakness

[img]http://upload.wikimedia.org/wikipedia/commons/9/9e/VMNH_megalodon.jpg[/img] Megalodon. The 50-60+ ft, 50+ ton mega shark that swam our oceans between 2 and 20 million years ago. This giant predator had few rivals, but he did have rivals, the most notorious being Brygmophyseter and Livyatan. But what were Megalodon's weaknesses? Well, besides maybe his gills, Megalodon did not really have any noticeable weakness. However, I was watching a show about Great White Sharks. It talked about how Killer Whales(Orcas), have been observed killing White Sharks pretty easily. How? Tonic immobility. All sharks, when flipped upside down, go into this state where they are almost in a trance. If they are held like this for too long, they can die. Megalodon almost certainly was susceptible to tonic immobility. Should a large Livyatan or a pod of Brygmophyseters, get a hold of a Megalodon and hold it upside down, it would not be able to fight back and they could kill the giant shark pretty easily. It seems Megalodon may not have been as invincible as previously thought. [img]http://www.hawaii.edu/himb/sharklab/pauleyimages/tiger-lateral.jpg[/img] (Example of tonic immobility)