This is another example of creationist stupidity– and crappy argument tactics.
To be far, we don’t have a satisfactory definition for species, as this post at BorderWars clearly shows.
But the term species is a whole less nebulous than the term kind.
I caracals and cougars aren’t the same kind, how on earth can one say that thylacines and dogs are?
LOL. They actually do make this claim!
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It kind (sorry, I couldn’t help myself) says it all doesn’t it?
Hey Scotty; you’ll like this one:
Researchers Show How New Viruses Evolve, and in Some Cases, Become Deadly
http://www.nsf.gov/news/news_summ.jsp?cntn_id=122949&WT.mc_id=USNSF_51&WT.mc_ev=click