Northern mockingbirds modify the sex ratio of their offspring according to the food availability and population density. There is therefore a bias for bearing the more expensive intercourse at the beginning of a breeding season when the food is ample. In passerine birds, like the northern mockingbird, females usually tend to disperse than males. An observational examine by Logan demonstrates that the female is repeatedly evaluating the standard of the male and his territory. In those cases, the mated feminine is constantly seen flying over both the unique and the new male’s territory, evaluating the qualities of each territories and exchanging calls with each males. The social mate displays aggressive behaviors towards the female, whereas the new male reveals less aggression and sings softer songs. Divorce, mate switching and additional-pair matings do occur in northern mockingbirds.
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