What are the similarities in the reproduction of birds and fish?

Common to these different types of vertebrates is the way of reproduction – sexual. Begins with the onset of the mating season. Males acquire bright colors in their outfit, participate in ritual duels between males, where the larger male wins. Courtship and dance around the female, seeking favor. All this causes a chain reaction of further sexual reflexes. These species reproduce in a similar way. The female birds lay eggs, and the female fish lays eggs. There is a similarity in the structure of eggs and eggs, and also in embryonic development.