This page ambitiously tracks all Creationist objections to evolution .... and apparently has a special fondness for the argument that Micro-Evolution is obvious.... but Macro-Evolution (aka: Speciation) is impossible.
Here are some interesting analogies:
[I have . . . ] previously written about the fictitious micro-macro distinction, most recently here: Ben Franklin, Compound Interest, and Evolution. We thought that an analogy between simple interest and compound interest would illustrate the imaginary micro-macro problem. And it works for some people.
But there are others for whom that isn’t adequate. So (this being a slow day for news) we herewith offer you some additional analogies to help illustrate the foolishness of the micro-macro issue: In each example, imagine a creationist uttering the statement:
I believe in individual steps, but not a whole flight of stairs.
I believe in paving stones, but not milestones; and certainly not entire roads.
I believe in points, but not lines; and certainly not long lines.
I believe in minutes, but not hours. Or hours, but not days. Or days, but not years.
I believe in twigs, but not branches. Most definitely, twigs are not connected to trees.