Wild Bird Spring (image) Max-Planck-Gesellschaft Caption For wild birds, spring does not always start at the same time. Scientists from the Max Planck Institute for Ornithology and colleagues have discovered that day length affects gene activity differentially in the brain of great tit populations from central and North Europe. Credit MPI for Ornithology, Radolfzell Usage Restrictions None 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.