One of the most challenging aspects of the large cat subject has been whether or not the animals in question are true types, hybrids or unknown species. some people think that they may be evolved types particular to the UK. Well, evolution is always at work, and all animals and plants are adapting themselves to survive, and that includes any mammals that are in the wrong place at any given time. But, what is the wrong place? that is surely a human concept as we think that something is either right or wrong and we tend to judge others albeit human or animal.There can be no wrong in the large scheme of things in relation to wildlife at least, as everything sorts itself out in the long run. We humans only look into the short term aspects of out fleeting lives in a  planet that has lived for billions of years, had many mass extinctions, continent misplacement, disruption of all kinds resulting in animal and plant species movements across the entire world. There is one easy way of looking at this; all animals and plants are native to earth regardless of what country they come from, just like people. I am not suggesting that we should allow all kinds of living organisms to flourish wherever they like or where humans want them to be, but where the damage has already been done I do believe that things should be left as they are and perhaps better prevention in future of none native animals or plants invading other lands if damage may well persist. Ecologists have been too keen to point to none natives and falsely claim that damage is being done. Many none natives play vital roles in the equilibrium of the food chain and if some species were to be taken out, then all hell would break lose and we would lose certain species that are native, but depend on none natives for food and recolonization of former habitats were they were once exterminated. Rabbits ,rats and grey squirrels are prime examples.There are many species that have caused much damage to environments of course. Pumas and leopards are not native and people would no doubt be quick to point fingers and accuse. Leopards were once native to the UK, when we were joined to Europe and there is actually no natural reason as to why they went.Pumas in their modern form have not lived in Europe. Cats are cats, and most of them are not specialists and are very adaptable and change to suit their environment.A leopard or puma would not be out of place in the UK as they would not target a certain species for food or to over hunt a species to  extinction.It is worth remembering that the natural range of the common leopard is the whole of the old world except Australasia. The natural range of the puma is the whole of the American continent. We could of had it on the other side of the Atlantic but that did not happen after the break up .The jaguar evolved into its type later on and survives today in the south America and some southerly North American states.The cats either adapt or die out.so far, both cats have survived and adapted and do what they do best and that is to eat a variety of prey especially deer, with some smaller carnivores alongside.Such a development is healthy within the natural cycles of life and vital .The UK has been without apex predators for such a long time that the balance had got out of hand hence the huge numbers of deer, foxes, badgers, rabbits etc.Now things can change for the better as the apex predator takes control,that is if the animals are allowed to do so by humans.Intervention could cause chaos if authorities were to work on the notion that these animals are detrimental to the environment. Having both puma and leopard is one thing but what if these animals have managed to interbreed and create a hybrid ? firstly, I know that many zoologists would naturally scorn at such ideas and given their general knowledge of such then that is understandable, but things can change especially if humans have interacted in an unnatural way. We have never been confronted with a situation of two similar species of large cats  that have not lived on the same continent co existing in a smallish area before, so have never reaped results.One can assume, but in reality, nature knows best and works in ways in which we humans are often surprised. Cats can interbreed and in captivity many hybrids have been created.In the wild they do not usually as they started off together then went their own different paths creating new species when and where applicable, that is how evolution works. When a certain situation arises such as too few of a certain species or two separate species co existing, then the species may try to merge back , almost like a devolution. Desperate animals can create change and maybe that has happened in the near past when there had not been too many of each species in question. I do believe that there are genuine puma and leopard in the UK  as well as lynx.The animals I have seen mostly fit the typical cat types to look at, but recently, over the last ten years or so there seems to be so much anecdotal evidence to suggest that cat species are hybridizing.I do believe that leopards and puma have been doing so.The behavior of animals seen by people seem to fit both species.The black, brown, spotted or striped cats seem to act more like pumas in respect to sounds,and movement, but like leopards in respect to hiding prey.I look at much hair collected mainly by myself but also other people from different parts of the UK and I am finding interesting results from my analysis. I look at the hair in a very basic way under the microscope and look at the medulla within the hair and the outer scaling.Leopards are different to puma or lynx generally but I am finding more hair that does not look like any particular species but as if a combination of two species, such as leopard and puma.Black hair that one would assume to be melanistic leopard has the medulla of a puma ! Also their seems to be giant domestic cats out there also! I do not know if there are puma and domestic cat hybrids but I think that it is very possible. So we have a dilemma on our hands:that not only do we definitely have leopard, puma and lynx living wild and breeding but we have all kinds of hybrid cats !This must cause a real head ache to all that are serious about biologically assessing what species we have.Then people will need to decide whether or not we want hybrid animals if indeed we want large cats of any kind in the UK. Again, left to nature things will settle down in time, I casually say. If we were to disappear and return a few thousand years from now, we may find an unknown species of large cat in UK unlike any we previously knew before. That species would have evolved from a mix of hybrids and recreated its own, or two species. That is how things happen. Humans on the other hand would want to intervene as usual and take control. I do not believe that authorities would want to leave things to settle down and let nature take its own route. I think that intervention of a lethal kind will prevail. Sooner or later a government department will meet and decide what to do,how to spend money on eradicating, how to tell the public, how to incorporate large cats into the teaching of environmental science, schools, farming, veterinary science, etc.One thing is for sure, given the current financial situation we are in , I cannot see any forthcoming proper eradication programme being successful, even if it were in place and had been for years.The animals are many and if we humans survive this century then many people are going to have to pick up the pieces.I personally do not see the cats as being a big problem at the moment, and I will reserve judgement on possible future problems or challenges.