To give you a sense of the rates of speciation we are talking about I did some quick calculations. There are approximately 33,000 living species of amphibians, reptiles, birds and mammals. For each of these groups there are certainly far more extinct species but going with identified extinct taxa I find about 3500 species of birds and more mammals. Combined with dinosaur kinds and the synapsids and so forth, a very conservative estimate of the number of species that would have had to have evolved since department Noah’s flood would be 60,000. AiG says all these species were represented on the Ark by a maximum of 1400 kinds. Therefore each kind would have given rise to an average of 42 species over the past 4350 years. That is roughly 1 new species per kind per hundred years. That doesn’t sound too extreme but that also translates to 1400 new species being formed per 100 years or 14 new land animal species evolving every single year. Now that is why we call that hyper- or rapid-evolution/speciation.
Now my 60,000 number was very conservative and AiG says there estimate of 1400 kinds is also very conservative. If there are only 700 kinds then double those numbers and if there are 100,000 or many many more land animals species then double that number again.
Now some young life creationists will suggest that maybe speciation occurred as a very fast rate the first several hundred years but Dr. Jeanson as AiG has attempted to show from genetics that speciation has occurred as a relatively even pace through time. If he is right we should be documenting up to dozens of new species evolving every single year. Now that would be really interesting news but I don’t hear about this speciation and why are YEC bringing these new species to our attention?