We found this big in our yard and can't decide what it is!

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image.jpg, 663 kb, 1372 x 1322

It is obviously a beetle of some description. Where are you in the world? It looks bloated, so may well be a gravid (pregnant) female. It appears as though there is some kind of ovipositor, although I don't know of any beetles in the UK that have this appendage. Alternatively, it could be the aedeagus of the male but again, the bloating doesn't seem to fit with this.

Not sure. More information or more photos may be really useful...