Sea urchins (IMAGE) Florida Museum of Natural History Caption One of the most extensive surveys of echinoids yet conducted in the Florida Keys suggests that sand dollars, heart urchins and sea biscuit populations have remained stable for the last several decades. Credit Images from Grun and Kowalewski, 2022 Usage Restrictions Credit must be given to the creator. License CC BY 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.