- A50, A57, A80 -

Become a Member Donate Calendar of Events Our Mission The mission of Thronateeska is to provide an environment where human natural and physical sciences can be explored to gain a better understanding of our changing world. Zygorhiza The whale species Zygorhiza is a 36millionyearold ancestor of moderntoothed whales and porpoises. This 20foot long creature had both pointed teeth for grabbing prey and sawedged teeth for slicing and chewing. This is the cast of a skeleton found in Twiggs County Georgia with a shark in its belly.