Reproduction - Northern Mockingbirds (Mimus polyglottos)
The males establish a nesting territory in early February. If a female enters his territory, the male will pursue the female with initial aggressive calls and, if she becomes uninterested, with softer calls. Northern Mockingbirds tend to be monogamous, and the female may return to the same male from the previous season.
(Northern Mockingbird nest with eggs, by ZooFari)
Both the male and female are involved in the nest building. The male does most of the work, while the female perches on the shrub or tree where the nest is being built to watch for predators. The nest is built approx. 3 - 10 feet above the ground. The outer part of the nest is composed of twigs, while the inner part is lined with grasses, dead leaves, moss or artificial fibers. The eggs are a light blue or greenish color and speckled with dots. Three to five eggs are laid by the female, and she incubates them for nearly two weeks. Once the eggs are hatched, both the male and female feed the chicks.
(Northern Mockingbird chicks, by ViciousKittens)
The birds aggressively defend their nest and surrounding area against other birds and animals. When a predator is persistent, mockingbirds from neighboring territories, summoned by a distinct call, may join the attack…
(read more: Wikipedia) (top photo: bobistravelling)