Maria has started to sing

Maria has started to sing to visitors, as she sits beside the dining room table. Is she singing for her supper?  It is not her purr, nor growl, which are very similar. It is not the baying of the New Guinea singing dog from San Diego zoo. Maria looks identical to this female in the clip which you can see on the internet. The Portuguese had a colony in New Guinea, which they called Isla da Papua. Probably they brought the dogs by sea, as they did to so many places. The dogs have now retreated to the mountains above 7,000 ft to escape from the savages who live lower down.

Maria was fixated by a recording of a Wagner opera from the Met, listening for over an hour and every now and then joining in with single notes within the soprano range.