The Eurasian hobby is a small, slender falcon with a relatively long, square tail, and long, scythe-like wings, giving it the appearance of a large swift in flight The upperparts and crown are slate grey, while the underparts are whitish or buff, heavily streaked black, with distinctive chestnut thighs and vent, and barred underwings and undertail. A pale throat and pale, double-peaked cheeks contrast with a bold, dark ‘moustache’, and there is a short, thin white streak above the eye. The legs and facial skin are yellow . The male and female Eurasian hobby are similar in appearance, while the juvenile can be distinguished by the browner, more mottled plumage, buff rather than chestnut thighs and vent, and bluish-grey to greenish legs and
