Compare and contrast how two different animals migrate?

Both fish and birds are similar because of their species. A bird is different from a fish because 1,800 of the world's 10,000 bird species migrate long distances each year in response to the seasons.[8] Many of these migrations are north-south, with species feeding and breeding in high northern latitudes in the summer, and moving some hundreds of kilometers south for the winter. A fish is different from a bird because Most fish species are relatively limited in their movements, remaining in a single geographical area and making short migrations for wintering, to spawn, or to feed. A few hundred species migrate long distances, in some cases of thousands of kilometers.So that is the compare and contrast of two animals now help me with mine  

The President in the executive branch can veto a law, but the legislative branch can override that veto with enough votes. The legislative branch has the power to approve Presidential nominations, control the budget, and can impeach the President and remove him or her from office.

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