Guarding Nest (image) University of Washington Share Print E-Mail Caption An adult male three-spine stickleback guards the nest, keeping the eggs free of debris and oxygenated. Credit Jason Ching/University of Washington Usage Restrictions Photo credit required. Share Print E-Mail 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.