The Nuttall Encyclopedia
The Nile bird, regarded as an avatar of deity, and held sacred by the Egyptians; it did not breed in Egypt, and was supposed to be of mystic origin; it arrives in Egypt when the Nile begins to rise.
Wood, James, ed. Entry for 'Ibis'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/i/ibis.html. Frederick Warne & Co Ltd. London. 1900.