By ADITHI RAMAKRISHNAN, AP Science WriterNEW YORK (AP) — Scientists have discovered a new dinosaur from Argentina with powerful claws, feasting on an ancient crocodile bone. This undated image provided shows researcher Marcelo Luna holding a claw belonging to a type of dinosaur called a megaraptoran in Chubut, Argentina. (Marcelo Luna via AP)This undated photo provide by Marcelo Luna shows the bones of a newly-discovered dinosaur with powerful claws in Chubut, Argentina. (Marcelo Luna via AP)This rendering shows what a newly discovered dinosaur called Joaquinraptor casali may have looked like, with the bones that were uncovered in blue. (Marcelo Luna via AP) Show Caption 1 of 4 This undated image provided shows researcher Marcelo Luna holding a claw belonging to a type of dinosaur called a megaraptoran in Chubut, Argentina.