Claw Sheath (IMAGE) North Carolina State University Caption These are TEM micrographs of (a) ostrich claw sheath and (b) Citipati claw sheath. In both samples, parallel fibres can be seen running diagonally, and identical voids (yellow outlines) were observed among the fibres in both samples. Credit Alison Moyer Usage Restrictions with credit 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.