Egg Size mMtters (IMAGE) Norwegian University of Science and Technology Caption Researchers found that the egg size of house sparrows could vary as much as by 50 per cent in volume from the smallest to largest egg. Credit Thomas Kvalnes, NTNU Usage Restrictions with credit and only in association with articles about this research License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.