The numbers of Australian species wiped out by introduced species is uncountable but understood to be very high.
Sadly if Joe is carrying something we don't yet have, he could accidentally wipe out 1000s amd 1000s of other birds. Do we prefer one death or many?
Actually I prefer quarantine, if his owner is willing to cover the costs. As a racing pigeon, his owner would be easy to find and if they can't pay for quarantining Joe they may prefer that he's killed. I can't recall the cost of quarantine but when I looked at it for fertile chicken eggs, it was rather high because of the duration required.
I do honestly understand, but from the sounds of it the owner in the USA isn’t taking calls about the lost little guy... and the person whose backyard he’s taken up residence in isn’t interested in starting up a coop for racing pigeons either. Granted, as he apparently landed on Boxing Day, and has been hanging out with the local doves, you could think that the damage, if any, has already happened. Maybe Mr Depp could be persuaded it would be some much needed good PR? Lol