Frogs in the genus Atelopus are also classified as harlequin frogs. Several species (maybe more than 30) are said to not be extinct, as researchers once reported. These species are still surviving in the wild and scientists are thrilled.
Check it out here: https://phys.org/news/2022-11-frog-species-thought-extinct.html
Photo credit: Pickerel Frog by Larry Master masterimages.org