The eighth episode of the S1 Megafauna Series.
Cause I used the conservation status like IUCN.
The first time im making about birds.

PENGUINS are a group of aquatic flightless birds from the order Sphenisciformes of the family Spheniscidae. They live almost exclusively in the Southern Hemisphere: only one species, the Galápagos penguin, is found north of the Equator. Highly adapted for life in the ocean water, penguins have countershaded dark and white plumage and flippers for swimming. Most penguins feed on krill, fish, squid and other forms of sea life which they catch with their bills and swallow whole while swimming. A penguin has a spiny tongue and powerful jaws to grip slippery prey.

They are three largest extinct penguins, there:

3. Kumimanu is an extinct genus of giant penguin, which lived around 60 to 56 million years ago. The type species is K. biceae, which arose after the extinction of the nonavian dinosaurs.
Fossils were found in New Zealand, and the discovery was announced in December 2017.
A second species, Kumimanu fordycei, was named in February 2023.

Kumimanu Fordycei is the largest known living or extinct penguin species, with an estimated weight of 148 to 159.7 kg. Some articles mention a height of about 5.2 ft (1.6 m), although the paper refrains from estimating height or body length because stem and crown penguins have different proportions, and nearly complete skeletons are absent.
The species name honours palaeontologist Ewan Fordyce.

2. Anthropornis is a genus of giant penguin that lived 4533 million years ago, during the Late Eocene and the earliest part of the Oligocene.
Anthropornis reached 1.8 m (5 ft 11 in) in length from the tip of the beak to the tip of the tail, and 90 kg (200 lb) in weight. There is also an estimate that one remain of Anthropornis can reach that body length of 2.05 m (6 ft 9 in) and 108 kg (238 lb) in weight.
Fossils of it have been found in the La Meseta Formation on Seymour Island off the coast of Antarctica and in New Zealand. By comparison, the largest modern penguin species, the emperor penguin, is just 1.2 m (3 ft 11 in) long.

The type species, Anthropornis Nordenskjoldi, had a bent joint in the wing, probably a vestigial trait from its flying ancestors.

1. Palaeeudyptes Klekowskii is an extinct species of the penguin genus Palaeeudyptes. It was until recently thought to have been approximately the size of its congener Palaeeudyptes antarcticus, which would mean it was somewhat larger than the modern emperor penguin, but a new study shows it was in fact almost twice as tall, earning it the nickname “Mega Penguin”. Its maximum height is estimated to be up to 2 meters (6.6 ft) and maximum body mass up to 116 kg (256 lb).

Credits: Enbiya Zengin & Sannimal Comparison