Zombie Snails

I didn't realize the snail would survive tentacle loss and regrow them. Another thing to think about when considering the selective pressures. It's a nice video but what is with the wavy vision? Is that bird drunk or is it having a flashback?

Here's another video of a fungal parasite I didn't mention. Curiously this manipulates ants in exactly the same way as the Lancet Fluke - making them climb grass stems and then clamp on with their jaws.