have certain advantages over published books and journals. What you’ll see today could be more widely presented in the future as biology, morphology and phylogeny move from books and journals to the Internet, complete with inexpensive animation, transparency and lap dissolves.
Obviously related to one another,
but isolated geographically to produce distinct species, the tiger (Panthera tigris) and the leopard (Panthera pardus, Fig. 1) are interesting to compare one skull with another. A GIF movie makes comparisons easy to see. A roll-over would be easier to handle, but roll-overs are not permitted on WordPress.com sites yet.