You wouldn't want to bump into this...

Spent ages watching this Salticus scenicus yesterday afternoon on the wall of my house. You really wouldn't want to meet this fella down a dark alley would you? The eyesight on these spiders is very good (four large, forward facing eyes) and they use it to hunt, jumping on their prey as they get close enough. They will also tilt their head to look at you as you approach - fearsome looking thing if you're a small insect.