Yes, penguins, like all animals, have gone through natural selection. Scientific evidence supports this notion.
Through ongoing natural selection a population adapts to its enviroment
Charles Darwin contributed to the evolutionary theory through study of natural selection.
Through natural selection and evolution
Natural selection acts on the genotype, but indirectly, through the phenotype.
Natural selection acts on the way organisms interact with one another and with their environment. The genes of organisms are not usually themselves involved in this interaction: they direct it through intermediaries such as proteins. So natural selection must work through these intermediaries to affect genes.
wolves hunting in packs
Wolves hunting in packs.
Survival characteristics that have evolved through natural selection in plants includes things such as broad leaves, cone shaped trees, and waxy leaves.
If by Darwin you're referring to Charles Darwin, he's not known to have invented anything. Charles Darwin was an English naturalist who through study and observation presented the theory of "Natural Selection" which is the basis for the modern theory of evolution.
natural selection
Through selective breeding or by natural selection.