Based on this information, one would expect them to be MONOGAMOUS AND SEXUALLY MONOMORPHIC. Monogamous means that the bird species normally have a partner per time for sexual reproduction. Monomorphic means that the two birds, both male and female show no difference between each other with the exception of their genitalia. That is the male and the female look the same.
The Digestive System, the Immune System and the Reproductive System have common functions because they all do the same thing. They all digest food but in their different ways
