Creationists, especially the bizarre YEC variety, often like to claim that no transitional fossils have ever been found. This, of course, is completely false (with a incredibly small number including Haasiophis terrasanctus, Pachyrhachis, Mososaurs, Pezosiren portelli, Runcaria and Halkiera) and more are being found all the time. That’s right, another transitional fossils has been found, analysed and seemingly verfied. And it’s a whale of a find (insert groan from audience here).
Remains of a species called Maiacetus inuus were located in Pakistan, what is remarkable about the find was the specimen had a fossilised fetus inside of it; it was pregnant when it died. This brought with it a whole lot of information, such as the manner in which the creature gave birth – in this case head first. For those not putting the pieces together yet, giving birth head first for a mammal is usually fine. But not if the mammal in question is underwater at the time. Therefore it seems rather likely this species lived in the water but gave birth on land, which is somewhat odd when you consider that it is a species of Whale. It is pretty hard to get a clearer example of a transitional species than that.