Little owl – Athene noctua
The little owl is a small owl with a flat-topped head, a plump, compact body and a short tail. The facial disc is flattened above the eyes giving the bird a frowning expression. The plumage is greyish-brown, spotted, streaked and barred with white. The underparts are pale and streaked with darker colour.It is usually 22 centimetres (8.7 in) in length with a wingspan of 56 centimetres (22 in) for both sexes, and weighs about 180 grams (6.3 oz).

The adult little owl of the most widespread form, the nominate A. n. noctua, is white-speckled brown above, and brown-streaked white below. It has a large head, long legs, and yellow eyes, and its white “eyebrows” give it a stern expression. Juveniles are duller, and lack the adult’s white crown spots. This species has a bounding flight like a woodpecker but the rounded wingtips and general appearance of the birds are quite different.Moult begins in July and continues to November, with male starting before female. Little owl has an extremely large range. It has been estimated that there are between 560 thousand and 1.3 million breeding pairs in Europe, and as Europe equates to 25 to 49% of the global range, the world population may be between five million and fifteen million birds. The population is believed to be stable, and for these reasons, the International Union for Conservation of Nature has assessed the bird’s conservation status as being of “least concern”.

It sounds like this
Recording by Dimitri from Xeno canto