It’s Spring!
If you’re hearing a mockingbird calling all day–and even through the night–chirping, sqeaking, and chacking, that’s because it’s spring.
Mockingbirds at Leon M. Weekes Preserve
Males generally establish a nesting area in February, and he sings his song in calls-of-three and non-stop throughout mating season.Other song birds are breeding, adding to all the chirping that’s going on. This male was singing to his female counterpart the other morning: 
This interesting description of Mockingbirds is from www.wild-bird-watching.com: As soon as a female enters his territory, the male mockingbird challenges her with a harsh “chacks.” The two birds square off and watch each other. The male pursues the female, and if she leaves he may try to entice her back with spread wings and soft calls.
Once a pair bond is established, the songs are shortend and more subdued. Sitting together quietly both mockingbirds make a “hew-hew” call to keep in contact.
Mockingbirds are strongly monogamous. If a male fails to find a mate he will sing loudly until late in the season. If no mate is found he will abandon his territory…I believe the male is on the lower branch in this photo, because of his larger size, and slightly larger white wing bar. It is difficult, otherwise, to tell the sexes apart because they look so similar.
