Today's drawing is Spinosaurus aegyptiacus! This is one of the largest species of theropod known, living during the Late Cretaceous period in what is now Egypt and other parts of northern Africa. This animal is best known for its enigmatic sail on its back, which may have served many purposes.
The sail of this animal, reaching 2 metres tall at the longest vertebrae, would have likely been a signature of sexual maturity, with infants lacking the structure, and it would grow as the animal aged. Spinosaurus was semiaquatic as indicated by its physiology, and this sail could have had some function in hydrodynamics, helping the animal stay stable in the water. It could have also been used similarily to how modern herons use their wings to hunt - the shadow cast by their wings attracts fish, making hunting easier. This sail could have also been used to store nutrients for times of hardship, as well as function as a sort of thermoregulatory structure (though unlikely), and as a display structure.
The anatomy of Spinosaurus is not very well known due to the fragmentary nature of remains. It has been proposed there be 2 species of Spinosaurus based on remains, and perhaps even a third if you lump Sigilmassasaurus. One of the most popular palaeontological memes was the quadrupedal spinosaurus from 2014 - this view was never broadly accepted in the scientific community, and was extremely inaccurate. The animals limbs were not scaled proportianate to the body, and the wrists could never withstand the weight of the animal. Spinosaurus hunted large fishes and sharks, and could have scavenged on dinosaur carcasses, and could have possibly tackled small pliosaurs which travelled through its Cretaceous estuary home.
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