I’d really like to know what justification the bloke had to shoot it, other than being a gamekeeper, who needs no justification to shoot anything that moves if he perceives it to be some sort of threat to the birds that are going to be slaughtered, in which case, what threat does a rhea pose to a pheasant?
And if I was the rightful owner of said bird, I’d be showing up at his door demanding the corpse and full compensation for the loss.
I don’t think this trigger-happy jackass has a leg to stand on, legally.
Seeing as how it had been happily grazing away for a month not causing any harm, the argument about being a traffic hazard seems spurious to me, especially considering how many deer run into the road, causing accidents, and their numbers aren’t reduced as a result.