do they follow any specific breeding patterns?
Yes, the males arrive before the beginning of the season to establish their territories and use a series of courtship displays to attract the females to their sites.
Northern mockingbird
The males arrive before the beginning of the season to establish their territories. The males use a series of courtship displays to attract the females to their sites. 
how long do mocking birds stay in the nest 11 to 13 days why are they called mocking birds? It has mimicking ability. where are they found? North America what colours are their feathers? Gray to brown upper feathers what do they eat? Arthropods, earthworms, berries, fruits, seeds, and occasionally lizards. how do they select their mates? Males sing songs to attract females.
wiki:19085889
Northern mockingbird [SEP] Breeding
Both the male and female of the species reach sexual maturity after one year of life. The breeding season occurs in the spring and early summer. The males arrive before the beginning of the season to establish their territories. The males use a series of courtship displays to attract the females to their sites. They run around the area either to showcase their territory to the females or to pursue the females. The males also engage in flight to showcase their wings. They sing and call as they perform all of these displays. The species can remain monogamous for many years, but incidents of polygyny and bigamy have been reported to occur during a single bird's lifetime.