Evolution is observable and testable. The misconception here is that science is limited to controlled experiments that are conducted in laboratories by people in white lab coats. Actually, much of science is accomplished by gathering evidence from the real world and inferring how things work. Astronomers cannot hold stars in their hands and geologists cannot go back in time, but in both cases scientists can learn a great deal by using multiple lines of evidence to make valid and useful inferences about their objects of study. The same is true of the study of the evolutionary history of life on Earth, and as a matter of fact, many mechanisms of evolution are studied through direct experimentation as in more familiar sciences.
Fossils such as Archaeopteryx give us snapshots of organisms as they adapt and change over time.
Studying modern organisms such as elephant seals can reveal specific examples of evolutionary history and bolster concepts of evolution.
Artificial selection among guppies can demonstrate microevolution in the laboratory.
Laboratory experimentation with fruit flies demonstrates the power of genetic mutation.
http://evolution.berkeley.edu/evolibrary/misconceptions_faq.php#b6
“(Archaeopteryx) the oldest-known fossil animal that is generally accepted as a bird.”
http://www.britannica.com/EBchecked/topic/32599/Archaeopteryx
Not transitional.