For example: evidently, no matter how big the ship that God had Noah build, it would not have fit all the types of dogs that we have today, or all the types of cats, or elephants that existed at that time, etc
However, it is evident that in a period of just over 4 millennia the types of animals that existed have varied greatly and have even appeared, not new species, but new classes of the same species, although with different characteristics than those they had.
Gen. 7:14 They went in with every wild animal according to its kind, and every domestic animal according to its kind, and every creeping animal of the earth according to its kind, and every flying creature according to its kind, every bird, every winged creature. 15 They kept going to Noah inside the ark, two by two, of every sort of flesh that has the breath of life. 16 So they went in, male and female of every sort of flesh, just as God had commanded him. After that Jehovah shut the door behind him.
Otherwise donkeys and horses would not have sterile offspring when they crossed each other. Maybe some call them speciation, for that reason, but the truth is that no matter how different donkeys are from horses, it is not impossible that they belong to the same species and that at some point it can happen again without a problem. It is not very difficult to see the similarity between a horse and a donkey, so saying that they are different kinds of animals might be an exaggeration.
It doesn't matter if evolutionists try to see it from their own atheistic (maybe?) perspective, but the explanation of different varieties of "similar" animals does not necessarily have to be related to the theory of the evolution of "new non-existent species". The perspective is "optional", and that does not mean that the theistic non-evolutiopnist perspective should be considered anti-scientific.