Single Blood Component Powerful Trigger for Large Carnivores (image) Linköping University Share Print E-Mail Caption African wild dogs compete for a log impregnated with blood or a single component. Both were equally attractive. Credit Linköping University Usage Restrictions None 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.