By 360 million years ago (the Devonian period), the scorpions had had their day. Next it was turn of the fish to grow large and take over the role of top predator. Some armoured fish, such as Dunkleosteus, grew to ten meters or more and even hunted the recently evolved sharks. Meanwhile, other types of fish were tempted onto land, lumbering aquatic beasts slipping and sliding after the creepy-crawly colonialists that had tried to escape the water. One or two found this new environment, with its dense moss forests, so attractive that their fins became firmer and five digits grew at the end. This was Acanthostega, the ancestor of all mammals, birds, reptiles and frogs. But land was no sanctuary. Lying in wait for Acanthostegsa was the deadly 'sliding fish' that could grow to 30 feet long and two tons in weight.moreless
Please read the following before uploading
Do not upload anything which you do not own or are fully licensed to upload. The images should not contain any sexually explicit content, race hatred material or other offensive symbols or images. Remember: Abuse of the TV.com image system may result in you being banned from uploading images or from the entire site – so, play nice and respect the rules!