Weevil Hip Joint (IMAGE) Helmholtz Association Caption Both parts of the weevil’s hip joint fit like screw and nut. This increases the mobility of the leg. Credit Source: KIT 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.