actually snakes have come thru the post office, along with many other animals. some offices are more strict than others, some give better care and attention to animals than others. either way when shipping live animals it is STRONGLY recommended that it is shipped EXPRESS MAIL with clear markings on the box of whats inside and what care is needed. like i said most offices will try their best to accomidate that. now why yours stopped with tracking might be a number of things, weather, traffic, overload at that facility, depending on the type of shipping it may only require a scan at arrival unit and delivered scan, maybe in your case that label cant be read (which is quite often) or scanned, or it got misdirected (which also happens). which is why its recommended express mail. express and registered mail are the most secure mail there is. either way i hope your new additions get you safely.