Mushrooms are fungi and most animals refrain from eating fungi because they are very toxic. Their toxin reacts most to the nervous system. Some may even digest you from within. But it's the rapid sporification of the fungi when they come into contact with moisture, that gives living organisms living hell.
But mushrooms, once a dominant type of vegetation throughout the planet, now just dwindled into the bottom of food chain. They live on dead and decaying vegetation. The poison is a coping mechanism to prevent itself from being eaten. To an extent all fungi are poisonous. Mushrooms grow big and fine in mountains because of good moisture. But it seems like wild mushrooms were eaten by the locals as they mistook it for edible ones.
Only an expert can differentiate edible from poisonous in case of mushrooms. So we should never eat any mushroom
I actually discovered I'm allergic to mushrooms. It's bizarre because I only tasted a mushroom soup once. That too, last year. But immediately my skin went all itchy and my tongue started stinging. I don't think I will ever touch this mushroom again.
The stronger a light shines the darker are the shadows around it.