Nest (IMAGE) Max-Planck-Gesellschaft Caption Thankfully, male blue tits don't have access to modern paternity tests: otherwise, they would discover every second nest features chicks that are not related to the care-giving father. Credit MPI for Ornithology 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.