Penguins are a remarkable product of evolution. All the varieties of penguins have several characteristics in common, including white chests, black backs, very tight feathers, wings shaped liked flippers, webbed feet. They are able to survive in the icy Antarctic environment - where there is little competition. They swim with their powerful wings, and predator birds flying above seldom see them because their black backs blend with the dark water, while predatory/prey sealife swimming below seldom see them because their white chests blend with the sunlight from above. Although they do not fly, they are able to use their feet and wings to launch themselves out of the water onto land or ice by a distance of about eight feet.
As a demonstration that this is a result of evolution, in the Arctic a very similar bird, the Puffin, has many similar characteristics, including the black back and the white chest, and tight feathers (but, unlike the penguin, it can fly). The two species are not related but similar environmental factors caused them to evolve in similar ways.
Not bio-engineered. There are photographs of penguins dating back to the beginning of the 20th century and eyewitness accounts and stuffed museum specimens dating back well into the 19th century. As well as the multitude of variant species, which took many centuries to develop.