Rock Sparrow Couple (IMAGE) Max-Planck-Gesellschaft Caption Hopefully, these two have no problems with infidelity: A rock sparrow couple enjoying their nestbox home. Researchers have now found out that males whose female companion plays away from home sing louder: Probably in a desperate attempt to tighten the pair bond to the unfaithful partner with particularly impressive sound volume. Credit Henrik Brumm/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.