![]() At 1.5 kg (3.3 lb) and up to 17.8 cm × 14 cm (7.0 in × 5.5 in), the ostrich egg is the largest egg of any living bird, : 130 though the extinct elephant bird and some non-avian dinosaurs laid larger eggs. Whale shark eggs typically hatch within the mother. The largest recorded egg is from a whale shark and was 30 cm × 14 cm × 9 cm (11.8 in × 5.5 in × 3.5 in) in size. Some embryos have a temporary egg tooth they use to crack, pip, or break the eggshell or covering. When the embryo is adequately developed it hatches, i.e., breaks out of the egg's shell. Eggs laid on land or in nests are usually kept within a warm and favorable temperature range while the embryo grows. Reptile eggs, bird eggs, and monotreme eggs are laid out of water and are surrounded by a protective shell, either flexible or inflexible. Most arthropods, vertebrates (excluding live-bearing mammals), and mollusks lay eggs, although some, such as scorpions, do not. Six commercial eggs - view from the top against a white backgroundĪn egg is an organic vessel grown by an animal to carry a possibly fertilized egg cell (a zygote) and to incubate from it an embryo within the egg until the embryo has become an animal fetus that can survive on its own, at which point the animal hatches. Membranes: allantois, chorion, amnion, and vitellus/ yolk. ![]() (Click on image for key) Diagram of a chicken egg in its 9th day. JSTOR ( February 2019) ( Learn how and when to remove this template message)Įggs of various birds, a reptile, various cartilaginous fish, a cuttlefish and various butterflies and moths.Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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