Bird Cage : To flatten and spread the strands of a cable or wire rope. Also the slatted or mesh-enclosed cage used to hoist workmen from crew boats to offshore platforms. (ITOGP)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}