I love Wikipedia: http://en.wikipedia.org/wiki/Boa

Erycinae subfamiliy
Compared to true boas, erycines are quite small, with most members remaining well under a meter in length. Fossil erycines have been found in rock strata over 50 million years old, and were once widespread in North America. Now, only two species remain in North America, as well as the sand boas in Africa, Asia and southeastern Europe.

At least three erycine species lay eggs: the Calabar Boa, (Calabaria reinhardtii) (once classified as a python for this reason); the Arabian Sand Boa, (Eryx jayakari); and the West African Sand Boa, (Eryx muelleri).

P.S. I've been thinking about adding BRB to my collection... those two kids look spectacular!