Heartleaf Oxeye (IMAGE) Aarhus University Caption Heartleaf Oxeye is an example of a species that has not yet returned to Northern Europe since the last Ice Age, but which we have helped along by planting in our gardens. Here it was found in the Danish countryside. Credit Photo: Jens-Christian Svenning, Aarhus University 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.