Why are emperor penguins considered a species they all look alike they can mate and produce offspring that cannot mate they walk in a similar manner

The correct is that they can mate and produce offsprings

Explanation:

One of the basics of biological classification is the species.

When two kinds of the same animals belong to the same species, what this means is that they have the capability of interbreeding between each other to give offsprings.

Generally, by definition, when we talk of a species, we are directly referring to individual groups that can interbreed with each other whether this is in actual fact or there is a possibility of an interbreeding potential between these groups

Thus, the reason why Emperor penguins are classified as a species is because of the fact that they can mate with each other to produce offsprings.

The species is the lowest classification of organisms that can interbreed and produce a fertile offspring. On the genus level, some animals can interbreed but the offspring produce is always sterile. This is nature's way of preserving a particular species and ensuring the continuation of that species. Penguins might look alike and walk alike, but they are very much genetically far apart. Their habitats and even their adaptation to these habitat varies and all these factors and many more other factors ensures that these species don't interbreed.