Which volture can be found in the western hemisphere?

Do you mean Vulture if so then here:

The New World vulture or condor family Cathartidae contains seven species in five genera, all but one of which are monotypic. It includes five vultures and two condors found in warm and temperate areas of the Americas. The "New World" vultures were widespread in both the Old World and North America during the Neogene.

fertilization is the union of an egg and a sperm cell i believe.