Alien eggs in the backyard

Recently I spotted what had to be an alien’s eggs incubating in our backyard.

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So naturally, I decided not to disturb them.

A little while later I went back and they’d “hatched’ but there was nothing to see other than a tiny slug. I’m pretty sure that’s a slug and not alien spawn.

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Today I found another one in a different spot but this time something was growing out of it.

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I guess they’re some kind of mushroom. Does anyone know? The stem looks rather like styrofoam.

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It’s not as exciting as an alien but very unusual to my eyes.