Frog skeleton (IMAGE) Florida Museum of Natural History Caption The radius and ulna of adult frog forearms are always fused into a single structure, as shown in this 3D model of the natal ghost frog, Hadromophryne natalensis. Credit Florida Museum model by the Blackburn lab 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.