black woodpecker
Refers specifically to the black woodpecker (Dryocopus martius), a large woodpecker species found in parts of Eurasia including Japan.
I saw a black woodpecker in a forest in Hokkaido.
Katakana spelling is common for this bird name; usually written in kana.
Hiragana spelling, also used.
Kanji spelling is rare and may not be widely recognized; lists it but the word is usually written in kana.
The name クマゲラ is a compound of 熊 (くま, 'bear') and 啄木鳥 (げら, 'woodpecker'), likely referring to its large size and black coloration reminiscent of a bear. The exact origin is uncertain.