In the evolution/creation “debate” (it’s not much of a debate if you ask me) a common fallacious talking point among creationists/intelligent design advocates is that no one has ever observed one species turning into another species, a process called speciation. Most people on the side of science correctly retort that evolution is a long process. But we needn’t even make this claim because the “no-speciation” claim by creationists is utterly false.
There have been hundreds of observed instances of speciation, and many have been documented in peer-reviewed scientific journals. There is a website — probably the most important web source for data on this topic — that lists 89 peer-reviewed articles showing instances of one species turning into another species. The author of this site claims to also have another 115 articles to add to the list.
I’ve gone through several of the articles, examined their methodology and accept their findings. I hope that after you show your creationist friends this evidence that they will soften to the fact of evolution. If you don’t have access to these journal articles and would like me to send you a pdf of a particular article, please click the link at the top of my page that says “Send me hate mail” and include the bibliographic information for that particular article, found at the bottom of the website in the link I’ve provided. Please copy it verbatim and post it into the message to ensure that I have the correct information. Please note that I have access to most academic journals but not all of them. I’ll do my best to find it.