No.
No.
Well, consider the domestic cow and the American Bison. These are certainly two seperate species, but, like many related species, they are able to interbreed. In this case, they can produce a new critter called a beefalo. This new animal, unlike a donkey, is fertile. It is genetically different from cows and bison.
I suppose you might argue that this is not a new species, but simply a new varient or strain. However, if we accept that bison and cows are different species, it becomes harder for me to accept that a beefalo is just a new strain of cow, while it is simultainiously a new strain of bison. Nonetheless, there is not a firm, well-agreed-upon point at which two different animals conclusively diverge into two seperate species, so we may have to agree to disagree about that.
The one gold-standard way of distinguishing one species from another is when they diverge so far as to be incapable of interbreeding. Unfortunatly, this usually takes a great deal of time, many thousands of years at a minimum, so it is going to be hard to find a concrete example.
If I can run down the details of an experiment involving fruit flies, that selected them for a long enough period that they were incapable of interbreeding with the original source population, would you accept that?