Do snakes give birth to live young and nurse them?

Some snakes (mostly vipers and boas) appear to give birth to live young. What really happens is that they retain eggs inside instead of laying them, and the young emerge when they hatch. This is called oviviparity.

Only mammals nurse their young. Snakes (like birds) are nourished by the egg yolk until they are hatched, then must fend for themselves. Unlike birds, they are not nursed or cared for by the parent.