Endangered species triggers reviews by scientists to verify it’s status. Habitat loss and degradation threaten the bumblebees status. South-west spring firefly, white-margined penstemon, and woodland salamander are all being reviewed for the endangered species list. The endangered species list requires further scientific studies of list organisms including development and implementation of population recovery plans.
https://www.theguardian.com/environment/2024/jan/24/us-endangered-species-list