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Placenta with attached fetal membranes (ruptured at the margin at the left in the image), which consists of the chorion (outer layer) and amnion (inner layer).. The part of the chorion that is in contact with the decidua capsularis undergoes atrophy, so that by the fourth month scarcely a trace of the villi is left.
A Senegal parrot chick at about 2 weeks after hatching. The egg tooth is near the tip of its beak on the upper mandible. The egg tooth is near the tip of its beak on the upper mandible. Borneo short-tailed python ( Python breitensteini ) hatchling with egg tooth visible A painted turtle hatchling with an egg tooth
The chicken (Gallus gallus domesticus) is a large and round short-winged bird, domesticated from the red junglefowl of Southeast Asia around 8,000 years ago. Most chickens are raised for food, providing meat and eggs; others are kept as pets [1] or for cockfighting.
Eggs of: ostrich, emu, kiwi and chicken. Egg size tends to be proportional to the size of the adult bird, [citation needed] from the half gram egg of the bee hummingbird to the 1.5 kg egg of the ostrich. Kiwis have disproportionately large eggs, up to 20% of the female's body weight. [18]
Figure 1. Feathering types in ten-day-old chicks.Left: Fast normal-feathering chick. Right: Delayed-feathering chick carrying sex-linked K gene. Delayed-feathering in chickens is a genetically determined delay in the first weeks of feather growing, which occurs normally among the chicks of many chicken breeds and no longer manifests itself once the chicken completes adult plumage.
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Wikipedia:Featured picture candidates/Chicken egg diagram; Wikipedia:Featured picture candidates/Chicken egg diagram2; Wikipedia:Featured picture candidates/June-2017; Wikipedia:Featured picture candidates/May-2017; Wikipedia:Featured pictures/Sciences/Biology; Wikipedia:Featured pictures thumbs/60; Wikipedia:Main Page history/2021 February 10
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