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]
Emperor penguin After laying, the mother's nutritional reserves are exhausted and she very carefully transfers the egg to the male, before immediately returning to the sea for two months to feed.[64] The transfer of the egg can be awkward and difficult, and many couples drop the egg in the process. When this happens, the chick inside is quickly lost, as the egg cannot withstand the freezing temperatures on the icy ground. The male spends the dark winter incubating the egg in his brood pouch, balancing it on the tops of his feet, for 64 consecutive days until hatching.[66] The emperor penguin is the only species where this behaviour is observed; in all other penguin species both parents take shifts incubating.[70] By the time the egg hatches, the male will have fasted for around 115 days since arriving at the colony.[66] To survive the cold and winds of up to 200 km/h (120 mph), the males huddle together, taking turns in the middle of the huddle. They have also been observed with their backs to the wind to conserve body heat. In the four months of travel, courtship, and incubation, the male may lose as much as 20 kg (44 lb), from a total mass of 38 to 18 kg (84 to 40 lb).[71][72]