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Two fossilized dinosaur skeletons found on a Montana ranch in 2006 are going on the auction block in New York City. They're expected to fetch between $7 million and $9 million.

The nearly complete skeletons are billed as the "Montana Dueling Dinosaurs." The sellers say the dinosaurs — one a plant eater, the other a meat eater — appear to be locked in mortal combat.

They're being sold as one lot at Bonhams auction house on Tuesday.

The skeletons were discovered by a fossil hunter on a neighbor's ranch in an area where dinosaurs once roamed.

The sellers believe one may be a close relative of Tyrannosaurus rex. The other may be a new species similar to Triceratops.

They hope a philanthropist buys them and donates them to a public institution.