Ummm,
Colubrids don't have spurs - only some of the pythons. And they don't get shed.
I havn't heard the lifespan thing either - unless your refering to overfeeding shortening lifespan in an animal you allow to become overweight?
House snakes are lovely little african snakes with cat slitted eyes - will try and grab you some pictures while he is still awake.
dr del