So Ive been reading thread and find it all very interesting, and I'm not as knowledge able as the rest of you but would like to give my thoughts on the matter.
1. I don't think there is a bigfoot out there, but hey I could be wrong. I just find it hard to think something that big could hide in the USA. Maybe if it was a jungle species from Bhutan etc then possibly but highly unlikely.
2. I think that the Amur and the Caspian were the same subspecies but on the way to becoming distinct groups due to breeding isolation. The mitochondrial work done in 2009 by Oxford uni et al showed there was only 1 nucleotide difference between the two. So I would say that is far to simillar to be classed as distinct. ( Although it was only mitochondrial not nuclear DNA gathered) The paper can be viewed on this link. I dont know if its viewable to all?
PLOS ONE: Mitochondrial Phylogeography Illuminates the Origin of the Extinct Caspian Tiger and Its Relationship to the Amur Tiger
3. I've recently been doing some reading on Pumas and although Im no expert I think probably there is only the one North American species. I dont think there has been enough breeding isolation and pressure for distinct subspecies to arise as of yet. I Florida example was only cut off for 100-200 years from the Texas population and really and significant change in genome in a slow breeding animal such as a puma will probably need alot more than that. (Unless you founding population is very small) A paper that you may have seen is found here. Again I dont know if access is avalible to everyone as Im logged on to my uni network.
http://jhered.oxfordjournals.org/content/91/3/186.full.pdf
4. Dinos have gone the way of the DodoBut cool relics remain like the Hoatzin!
1. Sasquatch creatures have been reported all over the world, not just North America. It is possible to hide in some parts of North America but not to many and probably not for a creature such as Bigfoot. Lots of Bigfoot sightings have occured in jungles worldwide and these definetly have a much greater chance of hiding a new primate species. Anyone ever hear of the Bili Ape, Myanmar Snub-Nosed Monkey, or the Lesula. Of course, these animals (except for mabye the Bili Ape) are much smaller then the Sasquatch.
2. We can all agree that the Caspian Tiger was seperating from the Amur Tiger. Weither it did or not... Up to you and future science to confirm.
3. If you'd like to discuss your views on Cougar subspecies, go to my thread (sorry for the name);
http://www.zoochat.com/2/tigers-lions-leopards-oh-my-big-295148/
4. The Dodo's extinction was an unfair and horrible event. The Spanish are the ones that wiped them out. What was taken as stupidity was actually a lack of fear as a result of no natural predators. The Dodo was a unique and special species that should not have gone Extinct along with all the specialized species of Mauritius.