Guam kingfisher
This petite kingfisher is extinct in the wild. There were as few as 30 individuals left in 1986, due to the introduction of the brown tree snake, which preyed on the small birds.
There were 139 birds in captivity as of March 2020, according to the Smithsonian Institute. Until the invasive snake population is brought under control, reintroducing the kingfishers to their native habitats in Guam may be a pipe dream.
