Cannibalism is the consumption of members of one's own species. It is generally considered taboo in the Real World, but among some fictional societies, it is accepted or even expected.
In the Redwall continuum, the term is used to refer to the consumption of other sapient beings. Molly Rath's attempts to eat humans therefore technically fall under this heading.
Debate rages as to whether the consumption of Mary Sues counts as cannibalism. For those who don't think it does, the cafeteria supplies Sue Soufflé and Water.