What about from reptile to bird? "The" piece (of course itīs only one of the many pieces) between bird and reptiles was found in germany.
Today are still birds with claws on the wings alive which they use to climb. Such birds are still living today in some jungle, but I donīt know which.

http://www.altmuehltal.de/moernsheim/museum/urvogel.htm

:L