Hand Showing the Extraordinary Claw-Like Spine (image) Pensoft Publishers Share Print E-Mail Caption Unlike other frogs, the new species has a claw at the base of the thumb. The function of this unusual structure is still unknown. Credit Gustavo Pazmiño, BIOWEB Ecuador Usage Restrictions CC-BY 4.0 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.