The facial pit underwent parallel evolution in pitvipers and some boas and pythons. It suffocates its prey by constriction, similar to the hunting technique of boas and pythons. A similar faunal divide is found in between the boas and pythons. Shortly thereafter, Joplin began wearing multi-coloured feather boas in her hair. Characteristics of rubber boas behavior also set them apart from other snakes. Eryx is a genus of nonvenomous boas known as Old World sand boas. The nerve endings here resemble those in the labial pits of boas. The usual size of mature female boas is between whereas males are . Historical Particularism is associated with the work of Franz Boas. After meeting Boas and Smithies, Weil composed the wedding announcement which contained several mathematical puns. Valle Peixoto de Villas Boas will serve as the interim leader of the SMOM. It was described by Frederick S. Boas as one of Shakespeare's problem plays. The best defense of rubber boas is their secretive nature. A recent overview is found at van Emde Boas (1990). He was highly regarded by authorities such as Boas, Sapir, Bloomfield and Tozzer.