<Ul> <Li> Sauropods (Sauropoda) <Ul> <Li> The largest dinosaurs, and the largest animals to ever live on land, were the plant - eating, long - necked Sauropoda . The tallest and heaviest sauropod known from a complete skeleton is a specimen of an immature Giraffatitan discovered in Tanzania between 1907 and 1912, now mounted in the Museum für Naturkunde of Berlin . It is 12 m (39 ft) tall and weighed 23.3--39.5 tonnes . The longest is a 25 m (82 ft) long specimen of Diplodocus discovered in Wyoming, and mounted in Pittsburgh's Carnegie Natural History Museum in 1907 . A Patagotitan specimen found in Argentina in 2014 is estimated to have been 40 m (130 ft) long and 20 m (66 ft) tall, with a weight of 77 tonnes . </Li> <Li> There were larger sauropods, but they are known only from a few bones . The current record - holders include Argentinosaurus, which may have weighed 73 tonnes; Supersaurus which might have reached 34 m (112 ft) in length and Sauroposeidon which might have been 18 m (59 ft) tall . Two other such sauropods include Bruhathkayosaurus and Amphicoelias fragillimus . Both are known only from fragments . Bruhathkayosaurus might have been between 40--44 m (131--144 ft) in length and 175--220 tonnes in weight according to some estimates . A. fragillimus might have been approximately 58 m long and 122.4 metric tons in weight . </Li> </Ul> </Li> <Li> Theropods (Theropoda) <Ul> <Li> The largest theropod known from a nearly complete skeleton is the biggest and most complete Tyrannosaurus rex specimen, nicknamed "Sue", which was discovered in South Dakota in 1990 and now mounted in the Field Museum of Chicago at a total length of 12.3 m (40 ft). Body mass estimates have reached over 9,500 kg, though other figures, such as Hartman's 2013 estimate of 8,400 kg, have been lower . </Li> <Li> Another giant theropod is the semi-aquatic Spinosaurus aegyptiacus from the mid-Cretaceous of North Africa . Size estimates have been fluctuating far more over the years, with length estimates ranging from 12.6 to 18 m and mass estimates from 7 to 20.9 t . Recent findings favour a length exceeding 15 m and a body mass of 7.5 tons . </Li> <Li> Other contenders known from partial skeletons include Giganotosaurus carolinii (est . 12.2--13.2 m and 6 - 13.8 tonnes) and Carcharodontosaurus saharicus (est. 12 - 13.3 m and 6.2 - 15.1 tonnes). </Li> <Li> The largest extant theropod is the Ostrich (see birds, below). </Li> </Ul> </Li> <Li> Armored dinosaurs (Thyreophora) </Li> </Ul> <Li> Sauropods (Sauropoda) <Ul> <Li> The largest dinosaurs, and the largest animals to ever live on land, were the plant - eating, long - necked Sauropoda . The tallest and heaviest sauropod known from a complete skeleton is a specimen of an immature Giraffatitan discovered in Tanzania between 1907 and 1912, now mounted in the Museum für Naturkunde of Berlin . It is 12 m (39 ft) tall and weighed 23.3--39.5 tonnes . The longest is a 25 m (82 ft) long specimen of Diplodocus discovered in Wyoming, and mounted in Pittsburgh's Carnegie Natural History Museum in 1907 . A Patagotitan specimen found in Argentina in 2014 is estimated to have been 40 m (130 ft) long and 20 m (66 ft) tall, with a weight of 77 tonnes . </Li> <Li> There were larger sauropods, but they are known only from a few bones . The current record - holders include Argentinosaurus, which may have weighed 73 tonnes; Supersaurus which might have reached 34 m (112 ft) in length and Sauroposeidon which might have been 18 m (59 ft) tall . Two other such sauropods include Bruhathkayosaurus and Amphicoelias fragillimus . Both are known only from fragments . Bruhathkayosaurus might have been between 40--44 m (131--144 ft) in length and 175--220 tonnes in weight according to some estimates . A. fragillimus might have been approximately 58 m long and 122.4 metric tons in weight . </Li> </Ul> </Li> <Ul> <Li> The largest dinosaurs, and the largest animals to ever live on land, were the plant - eating, long - necked Sauropoda . The tallest and heaviest sauropod known from a complete skeleton is a specimen of an immature Giraffatitan discovered in Tanzania between 1907 and 1912, now mounted in the Museum für Naturkunde of Berlin . It is 12 m (39 ft) tall and weighed 23.3--39.5 tonnes . The longest is a 25 m (82 ft) long specimen of Diplodocus discovered in Wyoming, and mounted in Pittsburgh's Carnegie Natural History Museum in 1907 . A Patagotitan specimen found in Argentina in 2014 is estimated to have been 40 m (130 ft) long and 20 m (66 ft) tall, with a weight of 77 tonnes . </Li> <Li> There were larger sauropods, but they are known only from a few bones . The current record - holders include Argentinosaurus, which may have weighed 73 tonnes; Supersaurus which might have reached 34 m (112 ft) in length and Sauroposeidon which might have been 18 m (59 ft) tall . Two other such sauropods include Bruhathkayosaurus and Amphicoelias fragillimus . Both are known only from fragments . Bruhathkayosaurus might have been between 40--44 m (131--144 ft) in length and 175--220 tonnes in weight according to some estimates . A. fragillimus might have been approximately 58 m long and 122.4 metric tons in weight . </Li> </Ul> <Li> The largest dinosaurs, and the largest animals to ever live on land, were the plant - eating, long - necked Sauropoda . The tallest and heaviest sauropod known from a complete skeleton is a specimen of an immature Giraffatitan discovered in Tanzania between 1907 and 1912, now mounted in the Museum für Naturkunde of Berlin . It is 12 m (39 ft) tall and weighed 23.3--39.5 tonnes . The longest is a 25 m (82 ft) long specimen of Diplodocus discovered in Wyoming, and mounted in Pittsburgh's Carnegie Natural History Museum in 1907 . A Patagotitan specimen found in Argentina in 2014 is estimated to have been 40 m (130 ft) long and 20 m (66 ft) tall, with a weight of 77 tonnes . </Li>

What is the biggest animal to ever walk the earth
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