A little bit off topic,
but this is very hard to observe in nature.
So here a small movie (~ 5 MB) of a Vipera ammodytes meridionalis (from a locality near Olymp mountain, Greece) giving birth to a baby. Filmed in 2006 in one of my terrariums.
Especially for Ilian, who asked for something like that!
http://www.vipersgarden.at/movies/BirthAmmo2b.wmv
Mario