The famous Darwinian theory of evolution, while popular, hinged on the assumption that links between kinds would be found in the fossil record, but they remain missing.
There is no evidence for evolution in the natural world, which was why Darwin hoped to find it in the fossil record, right? What Darwin did find in the Galapagos Islands was an astounding diversity among a variety of birds known as finches. So, logically, what he observed was the profound ability of animals to adapt to their habitat, something which is undisputed.
It could be noted that with the complexity and diversity of evolutionary theories today, and with the animosity in the ranks of the warring sects, evolution has become more a matter of faith than religion ever was.
It is also undisputed that sheep always give birth to sheep, and goats always give birth to goats.