* Manatees are large: Adult manatees can weigh up to 1,300 pounds. While bull sharks are powerful predators, they typically target prey smaller than themselves.
* Manatees are tough: Manatees have thick, tough skin and a layer of blubber for insulation. This makes them difficult prey for sharks to penetrate.
* Manatees are herbivores: Manatees eat primarily seagrass, making them less appealing as a food source for a predator that prefers meat.
While there are rare instances of sharks attacking manatees, these are usually attributed to mistaken identity, territorial disputes, or scavenging behavior.
It's important to remember that all marine animals should be treated with respect and caution.