It Is Hypothesized that way, yes, but I'm not entirely convinced. I mean-So many animals have thought to be fewer numbers than there actually are, take the Lord howe island stick insect for example-Or the Red crested-tree rat, But according to the Survey in 2019, it is definitely possible that only one remains, and this will be the 3rd animal that has gone extinct since I was born, (at least that scientists new about).The population may be as low as only one bird.