This 2017 video says about itself:
Top 10 Rarest Birds
Birds are the living gems of planet Earth. With their fascinating coloured plumes and beautiful calls, it’s no wonder that so many people find relaxation in bird watching.
However, with the advent of global warming and an otherwise rapidly changing environment, some bird species are in rapid decline.
We are lucky to have things like cameras to capture these rare beauties because we’ve compiled a list of top 10 rarest birds in the world you will never see while bird watching.
Number 10: Red-Crowned Crane
Number 9: Palila
Number 8: Great Indian Bustard
Number 7: Honduran Emerald Hummingbird
Number 6: Marvellous Spatuletail
Number 5: Brazilian Merganser
Number 4: Forest Owlet
Number 3: Orange-Bellied Parrot
Number 2: Crested Ibis
Number 1: Kakapo
I had the good luck to see crested ibis in China.