Alcaudón Chico vs Alcaudón Núbico

The most reliable field mark to distinguish the Lesser Grey Shrike from the Masked Shrike is the presence of a broad white supercilium in the Masked Shrike, which is absent in the Lesser Grey Shrike. Additionally, the Masked Shrike has more extensive black on the face, giving it a 'masked' appearance.

Look for the broad white supercilium and masked appearance in the Masked Shrike. Note the size difference, with the Lesser Grey Shrike being larger.

The Lesser Grey Shrike is generally larger than the Masked Shrike.

The Masked Shrike has a distinctive broad white supercilium and more extensive black on the face, while the Lesser Grey Shrike lacks a prominent supercilium and has a more uniform grey head.