The hefty penguin lived about 27 million years ago and weighed up to 130 pounds. The penguin, Kairuku grebneffi, lived in New Zealand. The tallest and heaviest ever known penguin stood nearly 5 feet tall and tipped the scales at around 130 pounds, according to a 27-million-year-old fossil found in New Zealand.
The penguin, Kairuku grebneffi lived in what is now New Zealand and likely speared fish and squid with its curved beak. In comparison, today's largest penguin is the Emperor penguin, which measures just over 3 feet tall and weighs approximately 85 pounds.
Yet another new big fossil penguin, Kairuku waitaki, was also recently discovered. It lived alongside K. grebneffi. "The Kairuku penguins were the last generation of so-called "giant penguins," the term indicating any fossil penguins that were much larger than the living largest Emperor penguin," co-author Tatsuro Ando of the Ashoro Museum of Paleontology in Japan said.
Ando explained that these big flightless birds emerged around 50 million years ago and thrived for about 25 million years before dying out. It remains a mystery as to why they disappeared, "but probably the drastic change in paleoenvironment was the cause of their demise," he said.
The researchers, led by Daniel Ksepka of North Carolina State University, analyzed the near-complete fossils for the penguins, which were unearthed at New Zealand's Waitaki Region. This area was known as Zealandia during prehistoric times, and it was a veritable penguin paradise.
"For much of its history, New Zealand has been sitting in the middle of the Southern Ocean, the sea that circles Antarctica," co-author Ewan Fordyce of Otago University said. "For millions of years, it has provided suitable land for rookeries (breeding grounds) and access to rich food resources in nearby seas."
New Zealand is a center of diversity for penguins. Out of the 17 existing species of penguin, six live and breed in New Zealand. The two new fossil species, from a distance, would have looked like modern penguins, Fordyce said.
Their long beaks would have enabled these penguins to spear prey, such as fish and squid. Sharks and shark-toothed dolphins, a type of prehistoric super strong dolphin with heavily toothed jaws, probably hunted the enormous penguins, which could have snapped back with their beaks.
The research team, which also included Craig Jones, mentioned that the oldest known penguin so far is Waimanu from New Zealand. "It lived 55-60+ million years ago, not long after the extinction of dinosaurs," Fordyce said.
Ksepka said one theory holds that penguins lost their ability to fly after the Cretaceous mass extinction. DNA evidence indicates that the closest living relatives of penguins are tubenose seabirds, such as albatrosses and petrels. Since the latter can dive to significant depths, the scientists suspect that the first penguins could both fly and dive underwater.
Stig Walsh, senior curator of Vertebrate Paleontology at National Museums Scotland, suspects that even taller penguins might be unearthed in the future but, for now, K. grebneffi is the height and weight champ.
THE GIST
The world's tallest and heaviest known penguin stood around 5 feet tall and weighed about 130 pounds.
The huge penguin lived 27 million years ago in New Zealand alongside other large penguins.
The largest living penguin is the Emperor penguin, which measures slightly over 3 feet.
