Why are hummingbirds becoming extinct?

No. There are many species of the moth that are apparently still thriving. Not all of them have been evaluated by population and habitat, and it is likely there are several historical species now extinct.

The genus Hemaris contains about 25 extant species. Despite their name and similarity in appearance to hummingbirds, they are insects, not birds. In the UK they are sometimes called Bee-Hawk Moths.