Common ostrich other members of Palaeognathae and thus the flighted tinamous are the sister group to the extinct moa. It is distinctive in its appearance, with a long neck and legs, and can run for a long time at a speed of or even up to about , the fastest land speed of any bird. The common ostrich is the largest living species of bird and lays the largest eggs of any living bird (extinct elephant birds of Madagascar and the giant moa of New Zealand laid larger eggs). The common ostrich's diet consists mainly of plant matter, though it also eats
François Lays on a high note, sent the minister a petition signed by almost all the stars of the Opéra and backed by Cherubini, asking for another benefit concert, in addition to the one three years earlier, this time in aid of his son who was working as a "saute-ruisseau"' at a notary’s and whose legal studies Lays could not afford to maintain. Inevitably the request fell on deaf ears. Lays also asked for his pension to be recalculated, bearing in mind his years teaching at the conservatory. But this led to disputes to which the correspondence between Cherubini and La Rochefoucauld