Reptile Egg Science

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Animal eggs come in different colors, shapes, sizes, and shell textures. Bird eggs feel hard. Snakes and many turtles lay soft-shelled eggs with a rubbery feel. Snake eggs are usually oval; turtle eggs are round to slightly oblong.

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Make A Reptile Egg

Here’s an easy-to-do Science experiment to transform an unshelled, boiled egg into a rubbery reptile egg! It’s perfect for the classroom or to do with your children at home.

A container of cider vinegar and an egg.

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Supplies Needed:

one unshelled, boiled egg
1 ½ cups / 375 ml cups of cider vinegar
clear 2 cup / 500 ml jar
tablespoon
dessert plate

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Boil the egg and let it cool. Ask children to describe the color and feel the hardness of the egg.

Place the unshelled, boiled egg in a jar of cider vinegar. Discuss the color of the liquid…yellow, red, and orange are words children might use for the hue. I suggest the word amber.

Put the jar in the fridge.

A boiled egg immersed in a jar half-filled with cider vinegar.

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After a couple of days, take the jar with the egg out of the fridge and have everyone view it. The cider vinegar will look a little foamy.

Scoop the egg out of the jar, place it on a dessert plate, and invite children to feel it. The egg will be tinged with brown residue. Ask children to describe the texture, which has turned rubbery.

A boiled egg taken out of cider vinegar after two days.

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New Discovery

The above egg is the result of the second time I tried this experiment! The first egg I used was not boiled, as I forgot to do it! I left the unshelled egg (in a jar of cider vinegar) in the fridge for two weeks before noticing it! When I finally took it out, it had a neat visual appeal. The outside of the uncooked egg felt rubbery, just as the boiled one did. When I poked it, soft insides spilled out. It was a happy accident that led to a new discovery!

An unboiled egg after being immersed in cider vinegar for two weeks. — Forgotten Reptile Egg

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An unboiled egg placed in cider vinegar for two weeks, then pricked with a fork to show the soft inside. — Forgotten Reptile Egg Insides

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Reptile Egg Science Printable

Extend the Science experiment by setting out this printable with reptile egg shapes to decorate and cut, or use as a play mat for matching turtle and snake figurines.