When viewed from space, they read: "Come and have a go if you think you're hard enough, you dreadlocked, boot-faced sissies." It probably seemed funny at the time. You would think this is because humans are particularly tricky prey, but it turns out the reason they hunt us obsessively is down to the mysterious Earth markings known as the Nasca lines. They've taken on Batman no less than three times, had a go at Tarzan, picked a fight with Judge Dredd, wiped out a Russian science station and generally got up to some serious mischief. As if taking down a commando team and half of LA's criminal underground in the two Predator films wasn't enough, their comic-based exploits have been truly prolific. Just what is it that marks Earth as a happy hunting ground to the Predators? These intergalactic hunters seem to spend half their lives on Earth, slashing and hacking their way through the populace at will.