You Can See the Eyes of This Transparent Spider Move inside Its Skull

Sorry for your terror, bbybleu, but that was a hilarious response!

Oh God, Oh God, Oh God, why did I watch that. Now I'll always think about their eyes watching me when I see one.

It is a jumping spider, family Salticidae, and an awesome one at that! Jumping spiders are active hunting predators that don't rely on webs to catch their prey, as such they have outstanding vision. If you've ever looked at one up close you can really see it looking back at you! Those things you see moving in the video are its anterior median eyes (AMEs). The AMEs are like scopes and provide the spider with super fine resolution over a narrow field of view, very useful for ... well, aiming.

Here's a great webpage on the anatomy of jumping spiders