![It's thought that Spinosaurus' sail was likely a display structure to possibly attract mates. Some birds do a similar thing where males look all fancy but the females look a bit plain. It's thought that Spinosaurus' sail was likely a display structure to possibly attract mates. Some birds do a similar thing where males look all fancy but the females look a bit plain.](https://preview.redd.it/iaeh6bpdawc41.jpg?auto=webp&s=8df6278c902debf5f74ce619f921593aafe768b3)
It's thought that Spinosaurus' sail was likely a display structure to possibly attract mates. Some birds do a similar thing where males look all fancy but the females look a bit plain.
![Illustrazione Stock Green Dimetrodon illustration. Sail-backed Dinosaur, blue crest on back. | Adobe Stock Illustrazione Stock Green Dimetrodon illustration. Sail-backed Dinosaur, blue crest on back. | Adobe Stock](https://as1.ftcdn.net/v2/jpg/05/09/96/18/1000_F_509961872_shQK0r9EGAsTmmja0nuhMTG76avtueel.jpg)
Illustrazione Stock Green Dimetrodon illustration. Sail-backed Dinosaur, blue crest on back. | Adobe Stock
![Illustrazione Stock Ichthyovenator was a dinosaur of the early Cretaceous. It was a spinosaurid with an unusual split sail. It was semiaquatic and ate fish. On a white background. | Adobe Stock Illustrazione Stock Ichthyovenator was a dinosaur of the early Cretaceous. It was a spinosaurid with an unusual split sail. It was semiaquatic and ate fish. On a white background. | Adobe Stock](https://as2.ftcdn.net/v2/jpg/03/93/47/61/1000_F_393476171_U6lerg8imTDpaZmqLKm0U7tTIYPHLgTf.jpg)
Illustrazione Stock Ichthyovenator was a dinosaur of the early Cretaceous. It was a spinosaurid with an unusual split sail. It was semiaquatic and ate fish. On a white background. | Adobe Stock
![Dimetrodon Reptile On White - Dimetrodon Was A Sail-back Carnivorous Dinosaur That Lived In North America And Europe During The Permian Period. Stock Photo, Picture And Royalty Free Image. Image 110631703. Dimetrodon Reptile On White - Dimetrodon Was A Sail-back Carnivorous Dinosaur That Lived In North America And Europe During The Permian Period. Stock Photo, Picture And Royalty Free Image. Image 110631703.](https://previews.123rf.com/images/catmando/catmando1810/catmando181000021/110631703-dimetrodon-reptile-on-white-dimetrodon-was-a-sail-back-carnivorous-dinosaur-that-lived-in-north.jpg)
Dimetrodon Reptile On White - Dimetrodon Was A Sail-back Carnivorous Dinosaur That Lived In North America And Europe During The Permian Period. Stock Photo, Picture And Royalty Free Image. Image 110631703.
![BSLIAO Jura Simulation Dinosaur Heterodontosaurus Sail Dragon Solid Plastic Small Kids Toy for Kids, 17.5 x 8.8 x 7 cm : Amazon.de: Toys BSLIAO Jura Simulation Dinosaur Heterodontosaurus Sail Dragon Solid Plastic Small Kids Toy for Kids, 17.5 x 8.8 x 7 cm : Amazon.de: Toys](https://m.media-amazon.com/images/I/61+GIPPQnsL._AC_SL1000_.jpg)