This is a vintage Italian green glass eagle decanter, most likely made by Bessi in Italy during the 1960s–1970s. Bessi Chianti produced these in Italy as decorative wine bottles, and the eagle was part of a series that also included cats, dogs, cars, and people.  The eagle head is removable and doubles as a shot glass, and the body features detailed feather and talon texturing.  They originally held Chianti wine and were popular decorative barware pieces.