It takes teams lifetimes to prove this, most people fail. While we do have compelling evidence, it may all be in vain. Weak minds prevail in this attempt to shine new life on our world.
UFO's and unidentified things have been found on cave drawing since man learned to draw. Many people believe aliens are the ones who helped us create our structures, and monuments. As long as there have been cameras there have been people getting these amazing pictures.
There are many different types of animals being tracked right now. Bigfoot being the most famous, the list includes, werewolves, mermaids, fairies, chupacabra, UFO's, and many other unbelievable creatures.
Why do people do it? The thrill of a new discovery. This would be my guess. Maybe they saw something when they were younger and need to prove it happened. Whatever the reason I hope they find something, it will be a great day for mankind. Although all the evidence seems to disappear rather quickly when the government gets wind of it.
Where are these things at? These creatures are all over the world, some legends may be right in your back yard. In fact there have been bigfoot sightings in almost every state. Check it out here.
So in short there are many things that have not been explained yet, and you could be the one to discover them.
Here is a couple of rules I would go by.
1. Always get video not a photograph, unless thats all you have.
2. Don't mess with it, if its dead leave it alone get authorities.
3. As soon as you get a photograph or video make sure it is great quality, and spread it over the internet as fast as possible.
4. Get the hell out of there before the MIB show up.
Heres a video of some photos for you to watch.