how long do finch eggs take to hatch
House finch The female lays clutches of eggs from February through August, two or more broods per year with 2 to 6 eggs per brood, most commonly 4 or 5. The egg laying usually takes place in the morning, at the rate of one egg per day.[14] The eggs are a pale bluish green with few black spots and a smooth, somewhat glossy surface. In response to mite infestation, which has a more deleterious effect on male chicks than on females, the mother finch may lay eggs containing females first, in order to reduce the length of time male chicks are exposed to mites. This strategy increases the liklihood that representative numbers of both sexes will survive.[15] The female incubates the eggs for 12 to 14 days. Shortly after hatching, she removes the empty eggshells from the nest.[16][17] The hatchlings are pink with closed eyes and tufts of fluffy down.[18] The female always feeds the young, and the male usually joins in.[14] The young are silent for the first seven or eight days, and subsequently start peeping during feedings.[13] Initially, the mother carries fecal sacs out of the nest, but when the young become older, she no longer carries them all away, allowing droppings to accumulate around the edge of the nest.[13] Before flying, the young often climb into adjacent plants, and usually fledge at about 11 to 19 days after hatching.[13] Dandelion seeds are among the preferred seeds fed to the young.[16] Most birds, even ones with herbivorous leanings as adults, tend to feed their nestlings animal matter in order to give them the protein necessary to grow. House finches are one of the few birds who feed their young only plant matter.[6]
Northern mockingbird A laboratory observation of 38 mockingbird nestlings and fledglings (thirty-five and three, respectively) recorded the behavioral development of young mockingbirds. Notable milestones included the eyes opening, soft vocalizations, begging, and preening began within the first six days of life. Variation in begging and more compact movements such as perching, fear crouching, and stretching appeared by the ninth day. Wing-flashing, bathing, flight, and leaving the nest happened within seventeen days (nest leaving occurred within 11 to 13 days). Improvements of flight, walking and self-feeding took place within forty days. Agonistic behavior increased during the juvenile stages, to the extent of one of two siblings living in the same area was likely killed by the other.[44]