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Those organs which have different basic structure (or different basic design) but have similar appearance and perform similar functions are called analogous Organs. There are many organs in different groups of animals which seem to be built from different basic structure but appear to be similar in shape and perform similar functions. These are called analogous organs.
For example: the wings of an insect and a bird have different structures (the insects have a fold of membranes as wings which are associated with a few Muscles whereas a skeleton, flesh and feathers support birds wings) but they Perform the same function of flying.