but see text "Precursor" is a controversial prehistoric bird genus from the Early Eocene.
[1][2] It was established based on fossils found in England, including in the famous London Clay deposits.
[1][3] These remains were originally considered to be members of the Charadriiformes, more specifically the earliest representatives of the Glareolidae (pratincoles and coursers).
[1] However, several authors have since found this interpretation to be dubious,[2][4] with the lack of measurements and contradictory wording making the original description's conclusions difficult to verify.
[5] At least some of the material, namely the paratype humerus of "P." parvus, has been re-interpreted as belonging to the Pseudasturidae (or Halcyornithidae), a group of stem-parrots, the remains of which (including a complete skeleton) were found in the Green River Formation in the United States.