In falconry, rangle is a term used for small stones which are fed to hawks to aid in digestion.[1] These stones, which are generally slightly larger than peas, are used less often now than they were historically.[2]
^Woodford, Michael (1960). A manual of falconry. CT Branford Co. p. 171.
^Ford, Emma (1982). Falconry in mews and field. BT Batsford.