If we propose intelligent design, we have to ask what we should expect to see.
I would expect to see things that we can determine a method for how they were made... that is, some mechanism for the creation.
If we stumbled upon some artifact that looked designed, we'd try to figure out how they made it. Usually, IDists say that you
don't have to know how something was made to determine it was designed, which is sorta true, but if we're given something that was designed, I think we'd be able to figure out some of the mechanisms used to build it.
So, assuming that the different kinds of animals were designed, its quite apparent that evolution was the mechanism for creating them. I haven't heard any other way for them to emerge other than magically poofing into existence, which is ridiculous.