When venturing into the outdoors, there is always a certain amount of risk involved. I think people used to take that for granted. The State of California (probably because they don’t want to be held liable) recognized that people probably aren’t as savy as they used to be, and therefore has posted signs about every dangerous animal you could possible encounter on your adventures into the wilderness.
Mountain lions and rattlesnakes are, to some small degree, avoidable while hiking. Especially rattlesnakes- at least if you are aware of them you can watch http://tramadolfeedback.com where you step and take precautionary measures. The sign about mountain lions at least tells you to wave your arms over your head and try to scare it away. I really don’t understand this sign:
“A shark attack occurred here in six feet of water.” Oh great. Something tells me waving your arms in the air isn’t going to do the trick if an 18 foot long great white thinks you are a seal.
Finally, my favorite sign from the Montreal Bioshpere: