Gastric Brooding Frog, Extinct in 1983, Dedecus - Shame.
Etching 4.5" x 3.5", by Abigail Rorer
Rheobatrachus, whose members are known as the gastric-brooding frogs or platypus frogs, is a genus of extinct ground-dwelling frogs native to Queensland in eastern Australia. The genus consisted of only two species, the southern and northern gastric-brooding frogs, both of which became extinct in the mid-1980s. The genus is unique because it contains the only two known frog species that incubated the prejuvenile stages of their offspring in the stomach of the mother.
https://en.m.wikipedia.org/wiki/Gastric-brooding_frog
TIL. That's pretty nuts