A Tree Sparrow Clutch (IMAGE) University of Veterinary Medicine -- Vienna Caption One of the five eggs in this clutch has a different pattern. This is often found in clutches of field sparrows. Credit Photo: Herbert Hoi / Vetmeduni Vienna 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.