In addition to Fafnir and Nidhogg, one of these creatures, Ladon, guarded the golden apples of the Hesperides and another, which was holding a princess hostage, was slain by Saint George.
One of these creatures with a woman's head was slain by Zeus in order to free the Cyclopes and Hecatonchires. Another had its teeth planted in a field by Jason, while a third possessed Andvari's gold. In addition to Fafnir and Nidhogg, one of these creatures, Ladon, guarded the golden apples of the Hesperides and another, which was holding a princess hostage, was slain by Saint George. For 10 points, name these really big mythological flying lizards that breathe fire.
One of these creatures with a woman's head was slain by Zeus in order to free the Cyclopes and Hecatonchires.
{Dragons} [accept equivalents]