spot-billed duck
A species of duck native to East Asia, Anas poecilorhyncha. In everyday Japanese, the kana spelling かるがも is standard.
A spot-billed duck is swimming in the park pond.
Standard kana spelling; usually written in kana.
The name かるがも is a native Japanese word. The kanji 軽鴨 literally mean 'light duck', but the exact historical derivation is uncertain.