No, natural selection is currently taking place in the snake population of Australia.
Not insignificant, but not evolution, unless there is evidence new genes or a new species.
One also has to chuckle at the anthropomorphic "nature is taking care of itself" commentary, which sound like declarations of faith. "Nature is happening" is closer to the mark.
I wonder, what animals indigenous to Queensland that were subject to the predation of larger headed snakes might now have their populations not so efficiently controlled?
Not true. Evolution is simply the change in allele frequencies from one generation to the next. Obviously, natural selection is guiding the change, which is evolution by definition!