There are plenty of human-dependent species, those that would surely go extinct without our active intervention (ironically, most probably pushed to the point of extinction by human presence). But the one I find most fascinating is the silkworm, the incorrectly named caterpillar of the domesticated silkmoth. They've been bred to create silk for over 5000 years, starting of course in China. During that time their wild counterparts have gone extinct and the domesticated silkworms would be utterly useless in the wild. They have been bred to build larger and silkier cocoons over time, to the point that the moths that emerge from the silk cocoons are unable to fly with their useless tiny wings, eat with their useless tiny mouth, or defend themselves with their nonexistent defense mechanisms. Crazy stuff.
Enjoy your Hamsterdam for the evening. Usual rules apply.
9/5 EDIT: The NFL season gets underway tonight with Dallas at New York on NBC. Otherwise there's, um, baseball... and stuff. -- Ross.