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Description
Size comparison of large animals that lived in South America between 100 million years ago and 65 million years ago.
Upper row: Alvarezsaurus calvoi (bird-like theropod with single-clawed forelimbs), Macrogryphosaurus gondwanicus (large, basal iguanodontian), Notosuchus terrestris (terrestrial crocodylian with pig-like snout), Enantiornis leali (large, toothed, predatory bird), Aucasaurus garridoi (medium-sized abelisaur with fingerless arms), Unenlagia comahuensis (feathered, bird-like dromaeosaur), Dinilysia patagonica (primitive snake), Armadillosuchus arrudai (heavy-armored terrestrial crocodylomorph) and Carnotaurus sastrei (large, horned, armored abelisaur).
Middle row: Abelisaurus comahuensis (basal, large-skulled abelisaur), Baurusuchus pachechoi (large, terrestrial crocodylian), Noasaurus leali (long-clawed abelisaur), Buiteraptor gonzalezorum (slender, long-jawed dromaeosaur), Gasparinisaurua cincosaltensis (small hypsilophodontid) and Austroraptor cabazai (large, short-armed dromaeosaur with crocodile-like teeth).
Lower row: Saltasaurus loricatus (medium-sized titanosaur, first known sauropod known to possess bony armor), Giganotosaurus carolinii (giant, huge-headed theropod, one of the largest ever), Kritosaurus australis (large hadrosaur with unclear identity) and Ekrixinatosaurus novasi (giant abelisaur related to Carnotaurus).

Description
Size comparison of large animals that lived in South America between 100 million years ago and 65 million years ago.
Upper row: Alvarezsaurus calvoi (bird-like theropod with single-clawed forelimbs), Macrogryphosaurus gondwanicus (large, basal iguanodontian), Notosuchus terrestris (terrestrial crocodylian with pig-like snout), Enantiornis leali (large, toothed, predatory bird), Aucasaurus garridoi (medium-sized abelisaur with fingerless arms), Unenlagia comahuensis (feathered, bird-like dromaeosaur), Dinilysia patagonica (primitive snake), Armadillosuchus arrudai (heavy-armored terrestrial crocodylomorph) and Carnotaurus sastrei (large, horned, armored abelisaur).
Middle row: Abelisaurus comahuensis (basal, large-skulled abelisaur), Baurusuchus pachechoi (large, terrestrial crocodylian), Noasaurus leali (long-clawed abelisaur), Buiteraptor gonzalezorum (slender, long-jawed dromaeosaur), Gasparinisaurua cincosaltensis (small hypsilophodontid) and Austroraptor cabazai (large, short-armed dromaeosaur with crocodile-like teeth).
Lower row: Saltasaurus loricatus (medium-sized titanosaur, first known sauropod known to possess bony armor), Giganotosaurus carolinii (giant, huge-headed theropod, one of the largest ever), Kritosaurus australis (large hadrosaur with unclear identity) and Ekrixinatosaurus novasi (giant abelisaur related to Carnotaurus).