ORIGINAL: BigglesFliesUndone
Does anyone else remember a cartoon series on TV ? Dick Dasterdly and Mutley in "stop that pigeon" ?
I seem to recall the carrier pigeon had a pouch tied round his neck to carry the mail
Says Mutley "HeeeHeeeHeeeHeeee"
A classic!

BTW, another entirely reasonable suggestions is that the chick is sporting a pair of binoculars.