As for me, the way "creation science" explains the extinction of species, especially in regards of the truth Darwin himself had the greatest difficulty to get rid of (species are immutable) is still unknown.
It is said that the thylacine, among other animals, was the only specie of its genus. I had chosen this exemple earlier for Kelly or whoever wished to answer, because it was a quite recent case, but she went on the dinosaurs.
If this kind of question is treated seriously by "creation science", then we may have a little hope for its legitimacy, among other little signs of real inquiry.
If we all agree on taxonomy, then it's a real question to be asked to creationists/ID supporters.