Pachydyptes

Pachydyptes is an extinct genus of penguin. It contains the single species "Pachydyptes ponderosus", the New Zealand giant penguin. This taxon is known from a few bones from Late Eocene (37 to 34 MYA) rocks in the area of Otago, which were found in two clades near a base of a tree (Ksepka et. al., 2006).
G.G. Simpson, an evolutionary biologist, estimated a height of 140 to 160 cm (about 5 ft) and a weight of around 80 to possibly over 100 kg (Stonehouse, 1975). it was the second-tallest penguin ever, surpassed only by "Anthropornis nordenskjoeldi" in height, but probably not in weight. This was because of the clade's evolutionary history, where many early penguins were typically found larger in size (Ksepka et. al., 2006).
G.G. Simpson had also claimed from the fossil records that the Pachydyptes along with many other early penguin species, descended from flying ancestors (Stonehouse, 1975). 
"Pachydyptes" was slightly larger than "Icadyptes salasi", the best-identified of the giant penguins.