During the prehistoric era, many reptiles had unique features like spikes, sails, and boomerang-shaped heads. Some reptiles used spikes as displays for mates or to breathe through their skin. Sail-backed reptiles like Dimetrodon could run fast despite their size, and may have used their sails to regulate body heat. Boomerang-headed reptiles ranged in size from 3 feet to smaller and used their horns for fighting or steering underwater. Steamy swamps during this time were home to giant millipedes up to 6 feet long, 180-foot tall ferns, and amphibians like Hylonomus.

1. Prehistoric Animals:
Rise Of The Reptiles
By:
Michael Jay
Presentation by: J M

2. Spikes And Tusks
 Some reptiles grew rows of spikes on their heads.
 Some dinosaurs used spikes as display for mates.
 Some reptiles who had spikes breathed through their
skin.

3. Sail-back reptiles
 There were multiple types of sail-back reptiles such as
the Dimetrodon living at once.
 They could run very fast, despite their sizes.
 The sails may have been used to control body heat.

4. Boomerang heads
 Some were very tiny. The smallest was 3ft(1m).
 The horns on their heads may have been used to fight.
 The horns also may have acted as underwater steering
fins.

5. Steamy swamps
 In these areas, millipedes grew up to 6ft.
 Ferns also grew very huge, the tallest being 180 ft tall.
 Many amphibians such as the Hylonomus lived in
swamps such as these.