Bird eggs are laid by females and their number varies from one to seventeen. Clutch size can vary with latitude within a species
Facts about bird eggs.
Sizes
Bird eggs vary greatly in size, host broadcasts like the birds themselves.
The largest egg produced in the bird kingdom is the ostrich egg - weighing up to 1.2 kg.
The smallest egg produced in the bird kingdom is the hummingbird egg - it weighs half a gram.
So, ostrich eggs are 2000 times larger than hummingbird eggs!
The elephant birds of Madagascar, now extinct, laid eggs about 14 inches long with a capacity of about 2 gallons—much larger than ostrich eggs.
The first and last set of eggs produced by chickens tend to be smaller than the others.
Amount
The name for one or more eggs produced by a bird in a nest at one time is clutch.
Some of the penguins, albatrosses and other seabirds that nest in inaccessible places lay only one egg in a clutch.
Mallards and game birds such as quail and pheasants, which have many enemies, lay in clutches of 15 or more.
Most warblers lay between 3 and 5, although burrow nestlers like chickadees can lay 8 or more; tropical species appear to lay fewer eggs than their northern relatives.
Hawks and owls lay more eggs when their prey is plentiful.
Clutch size can also vary within the same species as a result of many factors including habitat, health, nutrition, predation pressures and season.
Long-lived species tend to have smaller clutch sizes than short-lived species.
The evolution of optimal clutch size is also driven by other factors, such as parent-offspring conflict – where parents and offspring must compete for resources.
Face
A fancy mathematical word to describe the shape of an egg is flattened spheroid.
The word spheroid means that the egg is like a sphere, but it is not exactly a sphere. That's because the egg isn't perfectly round.
This shape results from the egg being pushed through the fallopian tube. The muscles pull the fallopian tube behind the egg and push it forward.
Cliff-nesting birds often have highly conical eggs. They are less likely to roll away, instead tending to roll in a tight circle; this trait probably arose as a result of evolution through natural selection.
Many hole-nesting birds have nearly spherical eggs.
Anatomy
Inside the egg, you have three main areas: the air cell, the white, and the yolk.
The air cell is usually at the larger end of the egg.
The air cell is caused by the contraction of the egg contents as it cools after being laid.
The air cell tends to get larger and larger as the egg ages and the embryo develops.
Egg white is called albumin.
Albumin has two main layers – inner (thin albumin) and outer (thick albumin).
Albumin's primary natural purpose is to protect the yolk and provide additional nutrition for the growing embryo.
Albumin is made up of 90% water.
Albumin is rich in protein and also has high nutritional value, but it does not contain much fat.
The egg yolk contains the growing embryo and its main food source – the yolk.
The yolk is an energy-rich food supply for the embryo.
The yolk is suspended in the center of the egg by filaments known as c Hal a ZA.
Egg yolk is yellow because it contains a lot of carotenoids.
Carotenoids are organic pigments that protect vulnerable tissues from free radical damage.
Free radical atoms, molecules or ions with unpaired electrons in an otherwise open shell configuration – these unpaired electrons are more unstable and highly reactive towards other elements, causing chemical reactions.
Inside the egg yolk, the embryo is surrounded by three membranes: amnion, ch Orion and allantois.
The amnion surrounds the embryo and provides the fluid in which it floats and grows.
The allantois is next to the amnion and helps the embryo breathe and excrete waste.
The ch Orion serves as a membrane around the egg yolk.
Shell
The outside of the egg is known as the shell.
Eggshells are porous – they have thousands of pores that allow gas to come in and out of the egg itself.
Eggshells get their colors from pigments added as the egg travels through the fallopian tube.
The original color of bird eggs is white, but egg colors have evolved through natural selection to suit their surroundings - mainly to camouflage them when necessary.
Eggshells are generally white in cavity nests, as they do not need to be camouflaged.
Eggshells are colorful and patterned in open nests because they need to be camouflaged.
Sunlight is also a factor in determining the color of bird eggs.
Birds that nest in huge colonies tend to have a wide variety of eggs - extremely variable in color and size. This could indicate that it helps the parents find their eggs.
Some pigments used in speckled eggs are now proven to strengthen the eggshell.
Songbirds (roosting or songbirds) tend to have a greater variety of shell spots than other bird species.
Research shows that birds nesting in forest areas where the soil is known to be low in calcium produce eggs that are more mottled.
The South American bird has solid metallic colors and a new car finish.
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