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Description
Size comparison of large animals that lived between 65 million years ago and 11 million years ago.
Upper row: Osteodontornis orri (huge seabird with bone teeth in it's beak), Sarkastodon mongoliensis (primitive carnivore with bone-cracking teeth), Gigantophis garstini (primitive, giant constrictor snake), Pyrotherium romeroi (elephant-like creature from South America), Mesonyx obtusidens (hoofed, wolf-like predator), Propalaeotherium parvulum (primitive, cat-sized horse), Pakicetus inachus (early, wolf-like, terrestrial whale), Megistotherium ostheotlastes (giant carnivorous mammal) and Champsosaurus profundus (crocodile-like reptile, that survived Cretaceous extinction).
Middle row: Uintatherium anceps (six-horned, sabre-toothed rhino-like herbivore), Entelodon gobiensis (monstrous pig with crocodile-like jaws), Ambulocetus natans (primitive, walking whale), Chalicotherium wetzleri (herbivorous mammal with clawed limbs related to tapirs nad rhinos), Gomphotherium simplicidens (four-tusked proboscidean), Leptictidium nasutum (primitive mammal with long, mobile snout and strong, leaping legs) and Arsinoitherium andrewsi (four-horned rhino-like herbivore related to elephants).
Lower row: Paraceratherium orgosensis (gigantic hornless rhinoceros), Pristichampsus rollinatii (running crocodile with hoof-like claws), Hyaenodon horridus (primitive carnivorous mammal), Brontotherium gigas (massive rhino-like beast with Y-shaped horn), Andrewsarchus mongoliensis (huge, carnivorous even-toed ungulate), Pachydyptes ponderous (large penguin from New Zealand), Gastornis parisiensis (huge, flightless, carnivorous bird related to landfowl) and Moeritherium andrewsi (semi-aquatic ancestor to elephants).

Description
Size comparison of large animals that lived between 65 million years ago and 11 million years ago.
Upper row: Osteodontornis orri (huge seabird with bone teeth in it's beak), Sarkastodon mongoliensis (primitive carnivore with bone-cracking teeth), Gigantophis garstini (primitive, giant constrictor snake), Pyrotherium romeroi (elephant-like creature from South America), Mesonyx obtusidens (hoofed, wolf-like predator), Propalaeotherium parvulum (primitive, cat-sized horse), Pakicetus inachus (early, wolf-like, terrestrial whale), Megistotherium ostheotlastes (giant carnivorous mammal) and Champsosaurus profundus (crocodile-like reptile, that survived Cretaceous extinction).
Middle row: Uintatherium anceps (six-horned, sabre-toothed rhino-like herbivore), Entelodon gobiensis (monstrous pig with crocodile-like jaws), Ambulocetus natans (primitive, walking whale), Chalicotherium wetzleri (herbivorous mammal with clawed limbs related to tapirs nad rhinos), Gomphotherium simplicidens (four-tusked proboscidean), Leptictidium nasutum (primitive mammal with long, mobile snout and strong, leaping legs) and Arsinoitherium andrewsi (four-horned rhino-like herbivore related to elephants).
Lower row: Paraceratherium orgosensis (gigantic hornless rhinoceros), Pristichampsus rollinatii (running crocodile with hoof-like claws), Hyaenodon horridus (primitive carnivorous mammal), Brontotherium gigas (massive rhino-like beast with Y-shaped horn), Andrewsarchus mongoliensis (huge, carnivorous even-toed ungulate), Pachydyptes ponderous (large penguin from New Zealand), Gastornis parisiensis (huge, flightless, carnivorous bird related to landfowl) and Moeritherium andrewsi (semi-aquatic ancestor to elephants).