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- Either of two cliff-nesting gulls(Rissa tridactyla or R. brevirostris) of northern regions, having a rudimentary hind toe. 三趾鸥后趾已退化的在悬崖筑巢的鸥（三趾鸥或红脚三趾鸥），居住在北部地区
- either of two cliff-nesting gulls(Rissa tridactyla or R. brevirostris) of northern regions,having a rudimentary hind toe 后趾已退化的在悬崖筑巢的鸥（三趾鸥或红脚三趾鸥），居住在北部地区
- Rissa tridactylan. 三趾鸥(鸥科)
- Rissa was the first Alchemist to perfect the art of converting useless soft metals into mercury. 瑞萨是第一个能将无用金属转化成水银的炼金术士。
- Any of several tropical American mammals of the family Myrmecophagidae, which lack teeth and feed on ants and termites, especially Myrmecophaga tridactyla, having an elongated, narrow snout, a long, sticky tongue, and an extended, shaggy-haired tail. 食蚁兽一种美洲热带食蚁科哺乳动物，没有牙齿，以蚂蚁和白蚁为食，尤其是三趾食蚁兽属有长而细的鼻子，长而粘的舌头和长毛蓬松的尾巴
- Saussurea tridactyla Sch.-Bip. 西藏雪莲花
- Rissan. 三趾鸥属;Rhode Island School Superintendents Association 罗得岛学校管理者协会
- any of several tropical American mammals of the family Myrmecophagidae,which lack teeth and feed on ants and termites,especially Myrmecophaga tridactyla,having an elongated,narrow snout,a long,sticky tongue,and an extended,shaggy-haired tail 食蚁兽，一种美洲热带食蚁科哺乳动物，没有牙齿，以蚂蚁和白蚁为食，尤其是三趾食蚁兽属有长而细的鼻子，长而粘的舌头和长毛蓬松的尾巴
- Myrmecophaga tridactylan. 食蚁兽
- Artemisia tridactylan. 指裂蒿
- Saussurea tridactylan. 三指雪兔子
- Glycera tridactylan. 绻旋吻沙蚕
