I decided to check on all my neighbors in order to find those eggs that can be hatched on  my own island. So far, I have gotten the following:

Mythic Air, Magma, Shadow

Observations: It is possible to hatch it more than twice; after trying a couple of times, it crashes sometimes.

Benefits: Get new monsters. For those repeated, they could only give you EXP or been sold to earn money if you hatch them and placed them in one of your habitats.

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