The structures that share a similarity in terms of their morphology, genetics, anatomy, embryology, may or may not have similar function but have the same origin are called as homologous organs. For example, the forelimbs of humans and the wings of birds look different externally but their skeletal structure is similar. The structures that look similar superficially and are dissimilar anatomically but does the similar functions are called as analogous structures. For example, the wings of birds and insects.