The Eurasian Kestrel (Falco tinnunculus) is a small falcon measuring about 33 cm in length. In Japan, it inhabits open environments such as riverbanks, farmlands, and grasslands, where it is often observed perched atop utility poles, signposts, or dead trees.
Sexual dimorphism is evident in plumage. Males show blue-gray tones on the head and wings, with a brownish back and tail marked by dark spots, while females are generally browner overall with heavier markings. Both sexes share a distinct black terminal band on the tail, which serves as a key identification feature.
During hunting, the species is well known for its characteristic hovering flight, beating its wings rapidly while scanning the ground below. Its diet consists mainly of small mammals, insects, and reptiles, which are captured by swift, low-altitude dives.
In Japan, the Common Kestrel is primarily a resident or partial migrant and is regarded as one of the more familiar falcons encountered year-round.