Ian who is 10, asked us.....
Do you know if there are any shark fossils that are more than 365 million years old?
Fossil fragments of fish on the lineage leading to sharks date back 455 million years ago. In 2003, scientists reported discovering an articulated skeleton of a shark relative called Doliodus problematicus that lived almost 409 million years ago. Here's the abstract of the paper.
Ian also expressed an interest in moving animals, so here is a link to a page about locomotion (how animal move) at Leeds University in England. There are some nice videos here of some very early work done (in the 1870's!) on locomotion by the English scientist Edueard Muybridge. He used a special system of cameras to make a series of photographs of animals to see how they moved and then reassebled them into an early form of film.