Eggs are among the major source of affordable protein needed by humans.
Double-yolk, yolkless and red yolk eggs are all forms of egg abnormalities.
Most of us eat egg but it is very seldom that we encounter abnormal eggs such as double-yolk, yolkless and red yolk eggs. In my lifetime, I had only encounter double-yolk egg twice. The first one was when I am still in elementary and the second was last week. I had seen a yolkless egg once and I don’t remember seeing a red yolk egg.
One of the most unusual forms of egg is the double-yolk egg. There are several reasons for the occurrence of double-yolk eggs:
- it occurs when ovulation occurs too rapidly
- it occurs when one yolk becomes joined with another yolk
- it may be the result of a young hen’s productive cycle not yet being synchronized
- hybrid breeds of hens also produce double yolk eggs by default.
- some hens will rarely lay double-yolk eggs as the result of unsynchronized production cycles.
A double-yolk egg is usually longer and thinner than an ordinary single-yolk egg. Double-yolk eggs usually only lead to observed successful hatchlings under human intervention, as the chickens interfere with each other’s hatching process and die
The second form of egg abnormality is the red yolk egg. This kind of egg has an extremely thick red yolk.
The third form of egg abnormality is the yolkless egg. An egg without a yolk is called "dwarf" or "wind" egg. This kind of egg since it contained no yolk and therefore can’t hatch.
See also
This unusual-looking mammal lives in forested areas of 
, United States and Mexico where it makes its den in a hole in a tree or in a rocky area. 
It is bright green in color with bluish spots along its dorsal ridge. The male species has 3 crests while the female species has one. It is also called Green Basilisk or Double Crested Basilisk. It can be found from Mexico to 
.
which is native to East Africa has a highly unusual set of physical traits that enables it to thrive in a harsh, underground environment, including a lack of pain sensation in its skin. It can be 10 cm in length and can weigh up to 80 g. 
is a unique-looking lizard with a very long lifespan reaching up to 20 years. This lizard, which is also known as the Mountain Devil, Thorny Dragon, Moloch and Thorny Lizard, is entirely covered with conical spines. 
in South America. It has strong hind legs and large ears and can weigh up to 8 kg.
. This spider with fangs that point straight down can attain a length of 25 mm.
. Then the spider bites through the silk walls and pulls the prey inside. The Red Legged Purseweb Spider rarely leaves its web for any reason other than mating.
is found mostly on the ground in open ground patches in thin forest. When disturbed this unique lizard sometimes runs with a bipedal gait. This lizard’s most prominent feature is its expandable throat, hence its common name. 
. The Chinese name is Sichuan Golden Hair Monkey and is also widely referred to as the Sichuan Snub-Nosed Monkey. 
, it is known as the Bekantan. This unique monkey of Southeast Asia uses its nose to attract mate ant to make warning calls louder. Its Malay name Monyet Belanda means ‘Dutch Monkey’ because Dutch people who colonized the area had large belly and nose too. Its amazingly large nose can be as long as 7 inches. At birth, a Proboscis Monkey has a blue face, blackish 
and a normal sized nose. But as it grows older, fur coloration changes and the nose grows. It is also simply the Long-nosed Monkey.
. 
Another prolific feature of this species is its naked, flesh-colored ears which stand out from the skin. It can grow up to 28 cm and can weigh as much as 400 g.
, hence it is also known as Chinese Pheasant. The face of Golden pheasant is extravagantly bright with its golden crest and rump. Its eyes are bright yellow in color. The throat, chin and the sides of neck are rusty tan. The wattles and orbital skin are both yellow in color. 
and it is also known as the Snow Monkey.
can grow up to 34 cm. It feeds mainly on fruits.
and 
are the two most popular ducks in the world. Now, meet the most brightly colored and pretty ducks. Most male duck species are much more colorful than females.
