Those links are worth reading though. You'll get insight into how a finch can turn into a finch, and bacteria evolved into bacteria.
Actually, it's how one species of finch evolved into about a dozen different species of finch, each with its own beak structure and size modifications that allow each species to feed on different food types.
Actually, it's how bacteria with previously no ability to resist drugs have rapidly developed an ability to resist nearly all antibiotics in existence, which is obviously a huge genetic change.
Given we haven't had anything close to enough time to observe (as an example) an amphibian evolve into a reptile, what we have observed is the strongest evidence that we could possibly expect to find in such a short span of time.
Maybe artificial selection is more your speed. Want to go into that and find out how an elephant sized bull was changed into every cow species and breed alive today?