An air space is formed between the two shell membranes at the thick end of the egg, on account of evaporation after the egg is laid. ” ​ — Ostrich Farming in the Little Karoo.
Pärast munemist tekkinud aurustumise tõttu moodustub muna tömpi otsa kahe nahkkesta vahele õhukamber ”. ( „Ostrich Farming in the Little Karoo ”.)