A hen that has just laid an egg and emits a shrill squawk.
2.
Any of various insectivorous Old World birds with a loud incessant song; in some classifications considered members of the family Muscicapidae. Synonym:babbler.
... the goddess Nut! Grant thou to me of [the water and of] the air which dwell in thee. I embrace the throne which is in Unnu (Hermopolis), and I watch and guard the egg of Nekek-ur (i.e., the Great Cackler). It groweth, I grow; it liveth, I live; it snuffeth the air, I snuff the air, I the Osiris ... — Egyptian Literature