We can find a lot of oddities and abnormalities in the animal kingdom: here’s a list that you should know well before you think you’ve ended up in some sci-fi movie.

1.Eggs with tails.

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This is likely caused by a hen trying to pass her soft-shelled egg and, in the process, the end portion of the egg got stuck and remained inside of the vent.

2.  Soft-shelled eggs.

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These eggs, unlike the shell-less eggs, in fact have a shell that contains yolk and albumen, but it is soft. It can occur in very old or very young hens. It can also happen when a hen is stressed or has a calcium or vitamin D deficiency.

3.  Speckled eggs.

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These small speckles can be caused by an excess of calcium. They also depend on the size and structure of the animal.

4.  Odd shaped eggs.

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Soft-shelled odd-shaped eggs: it can occur when there’s some sort of abnormal disturbance in the egg forming process.

5.  Green or blue eggs.

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There are three breeds that lay blue eggs: Ameraucanas, Araucanas and Cream Legbars. Green egg-layers are created by cross breeding a blue-egg-laying breed and a brown-egg-laying breed.

6. Very small eggs.

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Lovingly referred to as fart eggs, rooster eggs or fairy eggs, very small eggs typically are missing the yolk.

7. Egg within an egg.

It occurs when a hen releases a second egg into the oviduct before the first egg has completed the laying process.

8.  Multiple yolk eggs.

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This is a rare thing and is an oddity when it comes to eggs that are not intended to be eaten. It is impossible for more than one chick to develop within a single egg.

9.  Body-checked eggs.

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“Wrinkled” eggs are more commonly seen in older hens suffering from airborne disease.

10.  Incomplete pigmentation.

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According to Florida University research, contributing factors to this condition include stress and old age.

11. Round eggs.

A British woman sold a round egg for over $600: if you find it you could get rich.