Egg Color Arms Race (IMAGE) University of Chicago Press Journals Caption Host and parasite egg appearance has diversified over time, suggestive of a race between the host evolving new signatures and the parasite new forgeries. The outer circle is made up of host (tawny-flanked prinia) eggs, and the inner circle of parasitic (cuckoo finch) eggs. Credit Claire Spottiswoode Usage Restrictions None 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.