Black-Footed Ferret
How adorable! These cuties were announced extinct in 1979 until just two years later when a California ranch dog brought a dead one home. Then three decades later, the the black-footed ferret was declared to have successfully rebounded.
Sea Sponge
The sea sponge is commonly found in aquariums and ocean photography but it wasn’t so long ago that they were approaching extinction. They’re certainly funny looking but in a cute kind of way.