J.H. buddy I would actually have to disagree that orcas are more dangerous than sharks, lions or bears -- orcas are far more intelligent creatures than any of the 3 you've listed, esp. in their hunting techniques, and thus less likely to make a mistake about their prey, compared to say sharks, which frequently mistake swimmers/divers for seals etc. I could be wrong but I don't even think there have ever been any recorded attacks on humans by an orca let alone deaths.I don't get why people aren't scared of orcas, they are the world's dominant predator. Far more dangerous than a shark or lion or bear - a bull can be as big as the small end estimate of T-rex, and no less deadly.
Btw, in the wild, there are birds that clean crocs' and hippos' teeth, like cleaner shrimp, and they don't get eaten. If the croc thinks of you as a cleaner bird you might be safe.
[but agreed jaws7777 they can be utterly brutal when it comes to their prey].
Another crazy story though: once while water skiing in Alaska (during a break from commercial salmon fishing on a remote island in the summer, though of course still wearing dry suits), 2 orcas came up behind me, about 30 yards away. I signaled to my buddies in the skiff to head to shore because truthfully I was scared they'd look at me as bait or something to play with, but it was all for nought, they followed behind for a ways but turned away before we got to shore -- if those were great white or tiger sharks, could have turned out very differently.
And I don't know about lions but believe me, coming between a mama bear and her cub is one of the very last things on earth you'd ever want to do: rage incarnate.