Liddell-Scott-Jones

πύγαργος (pugargos) white-tailed hart ^G:N-M

πύγαργος-αργος, ὁ,

white-rump, name of a kind of antelope, [LXX+5th c.BC+]

__II a kind of eagle, perhaps Circus cyaneus, [Refs 4th c.BC+]; opposed to ὁ μελάμπυγος, [Refs 7th c.BC+]
__III a water-bird, perhaps dipper, Cinclus aquaticus, [Refs 4th c.BC+]

_{LSJ Scripture Refs: LXX.Deut.14.5}