Top image (IMAGE) Aarhus University Caption Pigs and humans are very similar. Human and pig organs are almost the same size, and many tissue types are almost identical. This is why pigs are useful when developing and testing new drugs. Thanks to the new findings, we know have even better knowledge about the similarities between pigs and humans. Credit Jesper Rais, AU Communication. Usage Restrictions Remember to give appropriate credit to photographer License Original 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.