1.
one (animal, insect, fish)
The counter for small to medium-sized animals, insects, and fish.
猫を一匹飼っている。
I have one cat.
一匹の犬が走っている。
One dog is running.
一匹狼の性格だ。
They have a lone wolf personality.
一匹 is the counter for small to medium-sized animals.
USED FOR:
- 犬、猫: dogs, cats
- 魚: fish
- 虫: insects
- 蛇: snakes
- Small mammals in general
NOT USED FOR:
- Large animals (use 頭): 馬、牛、象
- Birds (use 羽): 鳥
- Rabbits (traditionally 羽, but 匹 also used)
COUNTING (sound changes):
- 一匹 (ippiki)
- 二匹 (nihiki)
- 三匹 (sanbiki)
- 四匹 (yonhiki)
- 何匹 (nanbiki)
IDIOM:
- 一匹狼: lone wolf (independent person)