Well, millions of species, apparently, since only a few-thousand at the most absurdly optimistic stretch could have been on the ark, and there are now 20+million species. The standard creationist mantra is that speciation is impossible so God must have been hard at work since the disembARKation. (stand by for some blather about "adaption within kinds not being macroevolution")
INCOMING!!!!!!!
"Right...what's a cubit?"