You're being attacked by a deadly animal. There's not much time, so, here are your essential survival tips in lightning-fast form.
If it's a shark: Look your predator in the eye. Don't flail like something it might like to eat. Make your way to the shore backward... or, if you have to fight, go for the gills.
Job No. 1 is to deter an attack by showing the lion you're boss: Stand tall, wave your arms, etc. If that doesn't work, fight back with whatever you've got: hands, rocks and, should local laws allow it, firearms.
Read the ears. If they're fanned out, the elephant's probably bluffing. If they're back, "Be worried." Because this is another beast you don't want to get into a footrace with, back away slowly, or climb a tree.
Panicking will only fuel an out-of-control canine's aggression. So, stay calm. If you're jumped, protect your head, throat and thighs, and try to give the dog something to latch onto that's not you -- like your shirt sleeve.