northern hobby (Falco subbuteo)
A small falcon species. The name is usually written in katakana, as is common for bird names.
The northern hobby comes to Japan as a summer bird.
Katakana spelling is common for bird names and is the usual written form for this species.
Kanji spelling is rare; the word is usually written in kana.
The name combines 稚児 (ちご, 'child' or 'young person') and 隼 (はやぶさ, 'falcon'), likely referring to its small size compared to other falcons. The exact origin is uncertain.