Takahe is a large flightless bird which can be seen in New Zealand and was considered extinct until seen again in 1984.
Pygmy Tarsiers are small size animals which can be seen in Indonesia and were found again in the early 21st century after having disappeared for more than 100 years.
The Victorian Grassland earless dragon, was found after the Covid pandemic in the forests of Australia.
Quagga, one of the species of Zebra, was extinct in the 19th century but was found again in the late 20th century.
The American Alligator population was extinct ages ago but was re-discovered in the 21st century with a very low population.
The California Condor was in the position of extinction until the captive breeding was done to bring their extinction back.
Night Parrot, the parrot with a unique color of feathers, was extinct in the 19th century until seen again after 50 years in the mid 20th century.