According to the wonderful AI that helped me identify the animals in my photographs:

They are endemic to the Hawaiian islands, meaning they are found nowhere else in the world.

They are a type of goose with a distinctive black face and head, with buff cheeks and a striped neck. They are the rarest goose in the world and are a symbol of Hawaii.

And then I couldn’t resist asking the AI:
Is this the state bird?

Yes, you’re right! The Nene is indeed the state bird of Hawaii.  

It was officially designated as the state bird in 1957. It’s a very special bird, not just because it’s beautiful, but also because of its conservation story.  

The Nene was once close to extinction, with numbers dwindling to only around 30 birds in the 1950s.

Through dedicated conservation efforts, including captive breeding and habitat restoration, the population has rebounded, though it still remains a vulnerable species.