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When walking on all fours, A. simus stood 1–1.67 m (3.3–5.5 ft) high at the shoulder, with the largest males being tall enough to look an adult human in the eye. [ 45 ] [ 43 ] [ 46 ] The average weight of A. simus was ~625 kilograms (1,378 lb), with the maximum recorded at 957 kilograms (2,110 lb).
A number of bulges for muscle attachment on the humerus were unique characteristics of Patagotitan. In a depression (fossa) on the front upper portion of the humerus, there was a pair of scars above each other, with the top one being wider than tall and the bottom one being taller than wide; this was where the coracobrachialis muscle inserted.
Fossil remains show a trend for specimens to be larger on average in the Southern Hemisphere than in the Northern, with mean lengths of 11.6 and 9.6 meters (38 and 31 ft), respectively; and also larger in the Pacific than the Atlantic, with mean lengths of 10.9 and 9.5 meters (36 and 31 ft) respectively.
It exceeded 3 m (9.8 ft) in length, and would have weighed in at around 200 kg (440 lb), much larger than any other known mustelid, living or extinct. [157] [158] [159] There were other giant otters, like Siamogale, at around 50 kg (110 lb) [160] and Megalenhydris, which was larger than a modern-day giant river otter. [161]
The plant-eating dicynodont Lisowicia bojani is the largest-known of all non-mammalian synapsids, at 4.5 m (15 ft) and 9,000 kg (20,000 lb). [65] [74] [75] The largest carnivorous therapsid was the aforementioned Anteosaurus from what is now South Africa during Middle Permian epoch. It reached 5–6 m (16–20 ft) long, and about 500–600 kg ...
The bigger the animal, the thicker their legs have to be so they could support the weight without snapping. Meanwhile, a whale floats in water without the stress of gravity.
A new study posits that the ancient megalodon shark was longer and slimmer than previously believed. The ancient shark has been compared to the great white, but it may have more closely resembled ...
Giganotosaurus did not have a sagittal crest on the top of the skull, and the jaw muscles did not extend onto the skull roof, unlike in most other theropods (due to the shelf over the supratemporal fenestrae). These muscles would instead have been attached to the lower side surfaces of the shelf.