Definitions for "Convergent Evolution"
The development of similar structures in organisms that do not share a common recent ancestor (e.g. eyes of squid and humans).
The independent evolution of similar genotypes or phenotypes to yield similar character states.
Evolution of two or more different lineages towards similar morphology due to similar adaptive pressures. Examples of convergence are: fins or fin- like structures in fish, cuttlefish and whales; extreme similarity in alarm calls by five small birds; endothermy in dogs and ducks, wings of butterflies and birds.