A remarkably complete skeleton of the alvarezsauroid dinosaur species Alnashetri cerropoliciensis from Patagonia, Argentina, as well as two alvarezsauroid specimens from the northern hemisphere reveal how the once-mysterious lineage of theropod dinosaurs evolved and spread before continents drifted apart, challenging long-held assumptions about their origins. Alnashetri cerropoliciensis. Image credit: Gabriel Díaz Yantén, Universidad Nacional...
