I came across this at William Dembski's ID blog, of all places. Modern birds don't have teeth. Some have a serrated edge on their beak, but that's it. Recently, scientists found a way to make chickens grow teeth. It doesn't involve adding genetic material from other animals -- they already possess the necessary genes (just as whales possess the genes for hind limbs, as all regular visitors to this forum are well aware of). All they needed to do was make small tweaks to existing genes, and the research was prompted by a chicken who showed this mutation without human intervention. The discovery adds even further support to the claim that birds evolved from reptiles, and specifically from a type of dinosaur. Here's the link: Live Science: Surprise: Chickens Can Grow Teeth Is this evidence for common descent, or are chickens and crocodiles in the same created "kind"?