Males Red-backed Shrike have a grey head and a typical shrike black stripe through the eye.
Females and juveniles do not have the black eye mask of the male and are dull brown.
Juveniles are similar to females but differ by the scaly pattern on the mantle (back).

1st photo: A male. Oostvaardersplassen, The Netherlands, 19 July 2021
2nd & 3rd photo: A male. Gasterse Duinen, Drentsche Aa National Park, The Netherlands, 7 July 2020
4th photo: A male. Dwingelderveld National Park, Spier, The Netherlands, 24 July 2012
5th photo: A female. Dwingelderveld National Park, Spier, The Netherlands, 24 July 2012