When Penguins Stalked the Earth

Some 37 million years ago, a giant species of penguin, up to 2 metres tall, apparently roamed the icy wastes of Antarctica (http://www.theguardian.com/science/2014/aug/04/giant-penguin-fossil-antarctica). These impressive birds were much larger than the current record holder (the climate change-endangered Emperor penguin) and it has been calculated that they would have been able to stay submerged and fishing for up to 40 minutes. Presumably, this foraging advantage was more than countered by some disadvantage of the large body size (perhaps reduced ability to change direction?). Anyhow, they would have been an impressive sight.