Convergent evolution is the independent evolution of similar features in species of different lineages. Convergent evolution creates analogous structures that have similar form or function, but that were not present in the last common ancestor of those groups. Dogfish is a cartilaginous fish and a whale is a mammal both have streamlined body and show vivipary but belong to totally different groups. The former is a fish and later being a tetrapod mammal. Dogfish and whale are the examples of convergent evolution in animals as both of them have more or less similar body organization.
