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They were called sea monkeys. They were actually brine shrimp eggs you added to salty water. There are small toys made from Polyacrylamide a water absorbing polymer which is very similar to the material used in diapers. Very different from sea monkeys.

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14y ago
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15y ago

The expanding animal-shaped toys are sold under a lot of different names, and don't seem to have a typical generic name, but a few science-experiment sites call them "grow creatures."

They are made of a hydrophilic ("water-loving") polymer called a hydrogel, similar to the absorbent chemical in modern disposable diapers. The hydrogel is combined with another polymer which is hydrophobic (not rabid, just "water-hating"), which causes the animal to hold its shape as it grows, and which helps it maintain its shape as it shrinks if removed from water.

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15y ago

They are called foam animals

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Q: What are water grow animals that are toys that grows in water made of?
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