Questions

I seem to have all sorts of weird goings on at my place, here is another, i presume some type of mushroom, at first i though they were crow feathers but no, it's the black ones rather than the cream mushrooms behind.

I have the attached in gravel/ stones, all over the place, looks like seaweed but i live in the country and miles away from the sea. Its slimy and very slippy if walked upon.

Included is a photo of something that comes overnight, it is weird, I have a small dog and would it be harmful if she ate it.