Could we identify this bone I found

[Blowklouds]

While walking though a wash after a heavy monsoon flood, I recently came across this bone sticking halfway out of the sand. I live in southern Arizona and heavy seasonal rains carry tons of debris from the mountaintops, all the way down through the city. I obviously have not cleaned it up, as it still has some fibers stuck to it. It is very weighty and quite large. I'm guessing it's maybe a cow vertebra, but honestly I have no idea. Also, I cannot get over how it resembles a really cute smiling face with spiky hair

span widgetspan widget

[Fossildude19]

One side looks definitely cut with a saw, so cow vert may be correct.

I think there are two together here, though.