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I was cleaning out my pool with a leaf scoop the other day and found a small object, which I assume to be a sort of skull or cartilaginous structure of something that had died.

I live in Sydney, Australia and in the pool there were a large quantity of water boatmen and dragonfly nymphs.

What does this skull belong to, and what is the purpose of the hollow, bulbous mounds next to the eye sockets?


Skull front

Skull side

Skull back

Skull size (cm)

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