"We haven't found any transitional fossils"

This claim is simply out of pure lack of knowledge of Evolution (as are most creationist claims). Unfortunately, for these deniers of Evolution, ignorance of these fossils doesn’t mean they don’t exist.

If you explore this next link you will see that there are actually quite a few transitional fossils that we have found. Keep in mind this is only for Vertebrates. It also gives a solid explanation to why you don’t often hear about these transitional forms.

http://www.talkorigins.org/faqs/faq-transitional/part1a.html