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.
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.
One unshelled, boiled egg
1 ½ cups / 375 ml cups of cider vinegar
Clear 2 cup / 500 ml jar
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.
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.
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!
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.
(This printable was created in PicMonkey and is for personal or one classroom use only.)
Do you have a favorite experiment to do with eggs? I’d love to hear about it!
To view a video showing a snake hatching from an egg on the DK website, click here.
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© Annette Kaminsky