Pterosaurs

Photograph: Triangle

Pterosaurs were flying reptiles which lived in the Mesozoic era at the same time as the dinosaurs. Most pterosaurs were quite small, but in the Upper Cretaceous some grew larger than any other flying animals. The pterosaur Quetzalcoatlus had a wing-span of up to 12 metres.

As we can read in this piece of news there are plenty of unknown facts about the Earth past.
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Los pterosaurios eran reptiles voladores que vivieron en la era mesozoica al mismo tiempo que los dinosaurios. La mayoría de los pterosaurios eran bastante pequeños, pero en el Cretácico Superior algunos crecieron más que cualquier otro animal volador. El pterosaurio Quetzalcoatlus tenía una envergadura de hasta 12 metros.

Como podemos leer en esta noticia existen muchísimos hechos que desconocemos sobre el pasado de la tierra.

https://www.theguardian.com/science/2020/mar/28/scientists-discover-three-new-species-of-pterosaurs-in-the-sahara

3. REPTILES

Those are the characteristics used to define the reptile class:

1. They are mainly carnivorous, but they are some omnivorous species too. We can distinguish what they eat according to their shape and volume. Little reptiles are usually insectivorous (Chameleon). Long reptiles such as anacondas or crocodiles may eat big animals, such as a cow. 
2. They are oviparous, it means that they lay eggs, and those legs must not be incubated for a period of time. 
3. Offspring are not feed by their parents; they can be independent when they are born. 
4. They are cold blooded and breathe through lungs. 
5. Reptiles are covered by scales; some of them are venomous (komodo dragon). 
6. They usually are usually terrestrial, but some of them can be aquatic, such as sea turtles. Some other species spend much time on the sea (such as crocodiles). 
7. Scientist recognizes a total of 7,712 species of reptiles. Dinosaurs were reptiles.