Moon jellies, which are found in coastal regions around the world, have so many interesting characteristics. They are found in water with temperatures of 48–66 degrees Fahrenheit. 

They can live in what scientists call briny water, which is a mixture of salt and fresh water.  Although they can move to locations abundant with prey, most of their movements are dictated by the currents. 

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Nowadays, scientists are calling these animals as "jellies," and unlike the others, their jellyfish sting is only mild.  These invertebrates may have tons of features, but there are three unique ones that stand out from the rest. 

1. Moon jellies use "symmetrization" in fixing their injuries. 

Symmetrization is the process of re-arranging the entire body to stay semmitrical whenever a limb is lost. Jellies, unlike other invertebrates, use this method in fixing their injuries, according to The Christian Science Monitor.

While many animals without backbones simply re-grow their limbs, jellies have the capactity to rearrange themselves. This self-repair method is never seen before and probably the reason why they are able to survive the wild. 

Sea trutles, shore birds, fish and other jelly species feed on these poor moon jellies, that's why they are prone to getting injured. In addition, there was a study in the journal Integrative and Comparative Biology in 2010, which discovered that at least one-third of marine invertebrates can be injured at any given time. 

2. Moon jellies reproduce sexually and asexually. 

Just like any other species, jellies have both male and female. Now, can you imagine how they're mating?

There's only one word to describe it — amazing! The male will release sperm and the female will swallow it for fertilization.

What happens next is the fertilized eggs will go through the process of maturation inside the pockets in the arms that enclose the mouth, until they are ready to be released.   

After the release, they will have a short period to swim freely before settling in one spot as a polyp. According to the research study of Mystic Aquarium Institute for Exploration.

3. Moon jellies shrink when there's scarcity of food. 

These jellies are carnivorous, feeding on zooplankton, fish eggs, larvae and small shrimps. They catch their prey using their tentacles and bring them close towards their bell-shaped bodies. 

They have a unique ability to change their size, depending on food availablity, according to University of Massachusetts Boston. A study reveals that their body is made up of ninety-five percent water, so when there's food scarcity they shrink and lose water. 

TagsMoon Jellyfish, Jellyfish Sting, underwater, Study