Have you ever wondered what it would be like before human exists. What the world was like before all the pollution started to happen by us. Creatures like the size of king Kong were moving around about millions of years ago. According to the scientific logic it might have been the air and the resource the earth had that gave them so much energy to grow. And the food and habitats that are much more then what we have now.
You never know what you will meet at that time. Such as dragonfly that are dangerous and poisonous. It lived about 228 millions of years ago and the maximum size about 2.5 feet [ 76cm] And also the Goliath bugs which is about the size of your hand back in those times. And according to the scientist the largest beetle ever lived in those times was about 2.5 meters in leg span. I know that would be the size of two of our cars in the street. The atlas moth were pretty big too they were about similar size as the beetle.
Fishes were gigantic in those times they were all like whales back in our civilized world. The Leedsichthys known as a type of fish was about 16.8 meters in size, that would be the size of our home and the whole court. Unfortunately they became extinct just in the last 1000 centuries. Those Amphibians were gone possibly because of the global warming and the sea shrinking lesser and lesser.
Giant repletes were so giant that you would feel like a prey if you ever met one, but you won't. Back in about 60 million years ago the dinosaurs and reptiles ruled our planet. They were maximum about 6 or 7 meters tall according to science. The t Rex was about 4 meters that would be the size of all our trees in the yard pluses together or maybe more. The stegosaurus was quiet big too. A Elasmosaurus could be about 15 meters tall because of the neck and the tail.
Next after they became almost extinct giant mammals ruled our planet. They were smaller then the reptiles. A wool Mammoth would be about 4.3 meters that would be the size of two elephants or more. Or the herbivorous the Indricothem would be about 4.5 meters tall and the width.
That is about as much as I know of course I know more but that would be a never end stream so if you want to find out more than go and search it up on websites for more prehistoric creatures