The male Bluethroat (Luscinia svecica) has an iridescent blue bib edged below with successive black, white and rust coloured borders.
Females usually have just a blackish crescent on an otherwise cream throat and breast (5th photo).
Newly fledged juveniles are freckled and spotted dark brown above.

The Bluethroat (Luscinia svecica) consists of (at least) 10 subspecies that differ most strikingly in the ornamental colour pattern of the male throat.
The subspecies Luscinia svecica svecica (Red-spotted Bluethroat) of northern Europe and northern Asia, has a red spot in the centre of the blue throat.
The subspecies Luscinia svecica cyanecula (White-spotted Bluethroat) of southern and central Europe, has a white spot in the centre of the blue throat.
The subspecies Luscinia svecica magna in Turkey has no central spot.

1st, 2nd & 3rd photo: A male white-spotted Bluethroat. Uiterwaarden, Everdingen, The Netherlands, 15 April 2019
4th photo: A male white-spotted Bluethroat. Uiterwaarden, Everdingen, The Netherlands, 9 April 2018
5th photo: A femalewhite-spotted Bluethroat. Egmond aan Zee, The Netherlands, 30 May 2021