What in the world is growing in my garden?

What in the world is growing in my garden?

What is this?! It seems to start off as a yellowy-brownish color and turn white the next day. There are about 8 patches like this in the garden.
What is that?! It certainly doesn't look healthy! Thanks to anyone who can help identify it! ETA: Thanks everyone! I'm glad to find out it's harmless. I swear, my cats will eat just about anything! ;)
My very red bedroom

My very red bedroom

My garden in progress

My garden in progress

Please tell me this could be the work of squirrels.

Please tell me this could be the work of squirrels.

Living room pics newly updated

Living room pics newly updated

my houseplants : )

my houseplants : )

Plant ID — found in a gorge in upstate NY

Plant ID — found in a gorge in upstate NY