What plant/nut is this?

[TCUHunter34]

Found several of these along a stream/creek in CO over the weekend. What is this?

 

[brando20]

Looks like one of them space peanuts.

 

[jmez]

Bigfoot kidney stone.

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[GSPHUNTER]

Without holding in my hand, I'm thinking wild raspberry

 

[TCUHunter34]

Without holding in my hand, I'm thinking wild raspberry

It was definitely a form of nut instead of a fruit. I broke it open and the inside was similar to a walnut.

The first picture doesn’t show it great but there was a stem that on others is attached to a small twig/branch.

 

[Wrench]

It probably took a trip past a bear colon and shape shifted.

 

[flathead#2]

sea urchin