Video of a lynx calling, taken by a Parks Canada employee in my neck of the woods.
http://www.youtube.com/watch?v=jlYL1F56fRg
I've seen most of the coolest predators in this area (wolves, black bears, cougars, various owls), and the lynx is probably my favourite to see. They're just so damn awesome, and they don't panic and run away when they see people, so you can get a good long look at their behaviour.