It is commonly claimed creationists that there are no transitional fossils. Such claims are a tactic actively employed by creationists seeking to
distort or discredit evolutionary theory. Prothero has called that claim the "favourite lie" of creationists and further said that it was
"manifestly untrue".
A common, though fallacious creationist argument is that no fossils are found with partially functional features. Vestigial organs are common in
whales for example. Also, there is evidence that a complex feature with one function can adapt to a wholly different function through evolution in a
process known as exaptation. The precursor to, for example, a wing, might originally have only been used for gliding, trapping flying prey, and/or
mating display. Nowadays, wings may still have all of these functions, while also being used for active flight.
Although transitional fossils elucidate the evolutionary transition of one life-form to another, they only exemplify snapshots of this process. Due to
the special circumstances required for preservation of remains, only a very small percentage of all life-forms that ever have existed can be expected
to be represented in discoveries. Thus, the transition itself can only be illustrated and corroborated by transitional fossils, but it will never be
"caught in the act" as it were. Creationists often argue against this, claiming it is merely a convenient way to explain the lack of 'snapshot'
fossils that show crucial steps between species. Their anti-evolution arguments continue to be undermined as progressing research and discoveries fill
in gaps, and in modern thinking evolution is pictured as a bush of lines of development, not the simplistic ladder of progress imagined by
creationists.
Cover your ears and start yelling because here are some examples of transitional species.
Evolution of cetaceans and the
evolution of the horse, not to mention the very exhaustive evolution of humans.
[edit on 9/12/2008 by Good Wolf]