What needs to happen for a new species to form?

species don't just form. You need to have a mutation in the DNA of an original species and if that helps them survive, (they are camouflaged from predators so they live, reproduce, etc.) the trait is passed on to their offspring. As the trait is passed on, more and more of that species is surviving and the ones that dont have the mutation die naturally from predators and natural causes. Soon, all of the old organisms die and the mutation is present in all of the animals until another mutation shows up. This happens over a long period of time for larger organisms and for bacteria it happens in hours. That is why we have not found a cure for the common cold. It constantly changes so we cannot chase it. It is much faster than our brains are. Humans dont change because all of our mutations are fixed or covered.Like glasses, blind people have sticks, deaf people have sign language, paralyzed people have wheelchairs. WE surgically remove extra toes fingers and even tails. Humans wil not evolve unless we kill of these people. Which hopefully, no one plans on doing.