Sonja is a fictional character from the Underworld series of films. This character is the daughter of the vampire elder Viktor, introduced by flashback, in Underworld. Red Sonja, the She-Devil with a Sword, is a fictional character who first appeared in Conan the Barbarian #23 (Marvel Comics).
tetralogy (plural tetralogies) 1  A set of four works of art that are connected, and that can be seen either as a single work or as four individual works. They are commonly found in literature, film, or video games. ( 2 medicine) A combination of four symptoms.
Mammalogy is the branch of biology that deals with the study of mammals. It encompasses such diverse areas as the structure, function, evolutionary history, ethology, taxonomy, management and economics of mammals. Approximately 4,200 species of living mammals and numerous extinct species comprise the material for study.