Penguins weren’t always the petite, tuxedo-sporting birds we know and love today. Once, giant penguins the size of humans reigned supreme.

But how did they evolve into the creatures living in Antarctica? Scientists have discovered fossils that act like the missing link for their evolution — and it all happened after the dinosaurs went extinct.
Fossils from five partial skeletons were found on the Chatham Islands near New Zealand’s South Island. The fossils were found in the remote area during excavations from 2006 to 2011. The group was led by Monash University palaeontologist Jeffrey Stilwell.
The fossils belong to the newly discovered species Kupoupou stilwelli, the oldest known penguin that’s similar in size to modern penguins. Its name is derived from the indigenous Moriori people of the Chatham Islands. Kupoupou means “diving bird” in their language, Te Re Moriori. Stilwelli is in honor of Stilwell’s discovery.
This penguin lived around 60 to 62.5 million years ago, after the mass extinction event that claimed the dinosaurs 66 million years ago. The oceans were tropical and subtropical then, with no polar ice cap at the South Pole.
A study detailing an analysis of the fossils published Monday in the journal Palaeontologia Electronica.

Source: Missing link found to giant penguins the size of humans that once reigned supreme