English: A size comparison of various specimens of the theropod dinosaur genus Spinosaurus

References:

Ibrahim, Nizar & Sereno, Paul & Dal Sasso, Cristiano & Maganuco, Simone & Fabbri, Matteo & Martill, David & Zouhri, Samir & Myhrvold, Nathan & Iurino, Dawid. (2014). Semiaquatic adaptations in a giant predatory dinosaur. Science. 345. 10.1126/science.1258750.

Smith, J.B.; Lamanna, M.C.; Mayr, H.; and Lacovara, K.J. (2006). "New information regarding the holotype of Spinosaurus aegyptiacus Stromer, 1915". Journal of Paleontology. 80 (2): 400–406. Bibcode:1974JPal...48..524M. doi:10.1666/0022-3360(2006)080[0400:NIRTHO]2.0.CO;2. ISSN 0022-3360.

dal Sasso, C.; Maganuco, S.; Buffetaut, E.; Mendez, M.A. (2005). "New information on the skull of the enigmatic theropod Spinosaurus, with remarks on its sizes and affinities". Journal of Vertebrate Paleontology. 25 (4): 888–896. doi:10.1671/0272-4634(2005)025[0888:NIOTSO]2.0.CO;2. ISSN 0272-4634.

dal Sasso, C.; Maganuco, S. (2018). "The smallest biggest theropod dinosaur: a tiny pedal ungual of a juvenile Spinosaurus from the Cretaceous of Morocco". https://peerj.com/articles/4785/

Spinosaurus silhouette based on:

Franoys (https://www.deviantart.com/franoys/art/Spinosaurus-aegyptiacus-skeletal-FSAC-kk-11888--706404751)

Human silhouette from File:Silhouette of man standing and facing forward.svg.