Observed speciation is rare, yet in the creationist post-flood model, it presumes hyper-speciation. So, creationists argue that the only reason “evolutionists” need to believe the earth is “millions and billions of years” old is to prop up their model of biodiversity, which obviously takes time. But, in their own model, which presumes some non-miraculous mechanism for “speciation within kinds,” two generations is enough time.
Joel Duff ran the numbers using estimates from AIGs own creation museum signage:
But we should also consider that we are talking averages but most “kinds” are not average. Some types of organisms are more diverse (specious) than others. For example, the songbirds (finches and sparrows) are a highly diverse group. Independent researcher Dr. Jean Lightner working with The Ark Encounter believes that all finches and sparrows are the same created kind and thus were represented by only a pair (or seven) of individuals on Noah’s Ark. This large collection of many bird families under the general finch/sparrow type constitute nearly 1500 living species. Here is what Dr. Lightner* has written about these specious birds:
However, perhaps the most astounding group identified based on interspecific hybrid data is Passeroidea. Encompassing Old and New World sparrows, various finches and related birds, this represents an amazing amount of variety in the nearly 1500 species. It is clear that this diversity didn’t arise since the Flood by the standard naturalistic explanations of neo-Darwinism, that is, chance mutations and natural selection (Lightner 2013)!
Leaving aside the surprising statement that this diversity did not arise by mutations and natural selection given that she and other YECs do not believe that God intervened miraculously to make these species in such a short time, this is a quite astounding admission of massive hyper-speciation since the Flood. 1500 species have formed in just 4000 years? Really? (See: Invoking Super-speed Evolution, the YEC Big Bang of Birds)
Actually, the answer is No. It’s worse that that. The 1500 only accounts for the living species of finches not the many lineages of finch species that have gone extinct and not left any descendants for us today. How many extinct species of finch are there? It is difficult to know how many extinct lineages there are but at least 50 are known despite the rarity of preservation in the fossil record. It would not be unreasonable to believe that there are another 1000 species of songbirds that have come and gone in addition to those we have today. If this is the case the YEC must propose that in excess of 2500 species evolved from a single pair of birds in less than 4500 years. That would require the origin of a new species of songbird every two years.
Just imagine an American Robin ( Turdus migratorius ) giving birth to a whole new species every second generation. There are 86 species of thrush (genus Turdus ) which is just one type of songbird and yet there is not evidence to suggest that these species have not existed for thousands of years. Where is the evidence for constant speciation occurring within these groups?