The great auk (Pinguinus impennis) was a large, flightless seabird of the North Atlantic that became extinct in the mid-19th century.

( Oh god I'm using AI to research this ...)

The great auk, also known as the penguin or garefowl, was the only modern species in the genus Pinguinus and first appeared around 400,000 years ago
Wikipedia. Standing about 75 centimeters (30 inches) tall and weighing roughly 5 kilograms (11 pounds), it was the largest alcid to survive into modern times
Wikipedia
+1. Its black back and head contrasted with a white belly, and during the breeding season, it had a distinctive white patch over each eye, which changed to a white band between the eyes in winter

Pictures show it looked a bit like a cross between a very large puffin ( without the colourful beak) and a penguin...

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