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Ursae is a monster group, (akin to subfamily of real world biology). According to in-game Bestiary, it has two genera in-game: gargantuan and plummeting ursa. Ursae belongs to The Wilds family.
Ursa in Latin means (female) bear. The male form is ursus. The in-game monster Tyrannursus Maximus is an undead gargantuan.