noun
Counter for birds and rabbits. Used with the reading いちわ. The counter 羽 (わ) is specifically for birds and rabbits; other animals use different counters.
See also: 羽
庭に一羽のスズメがいる。
There is one sparrow in the garden.
彼は一羽のウサギを飼っている。
He keeps one rabbit.
羽 is the counter itself, while 一羽 specifies the quantity 'one'.
一匹 is used for small animals like cats, dogs, and insects, whereas 一羽 is used for birds and rabbits.
Compound of 一 (いち, 'one') and the counter 羽 (わ, 'feather'), used for counting birds and rabbits.