The Northern Darwin’s Frog The Northern Darwin’s Frog—endemic to Chile—is one of only two frogs in the world to undergo “mouth brooding,” in which a child is reared within its father’s vocal sac. Despite being around since at least 55 million years ago, the frog has been all but wiped from the face of the earth—one has not been seen since 1981—largely due to deforestation, climate change, and possibly disease. Nonetheless, hope remains, according to the Zoological Society of London, that one may be seen eventually, and so they are not yet listed as completely extinct.

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