A lifetime studying similar lifeforms = wild ass guess by person off the street. No one knows absolute truth BUT there are those of us who have (through hard work and study) learned enough to make something rather a bit better than that wild ass guess.
As for the environment at the time, you can tell a lot about that by what was growing in the same layers. If you find trees and tree pollens there were probably trees. If you find desert dwelling reptile bones and cacti spines there's a good chance it was a desert. If there are mollusks attached to the rocks it was probably under shallow water.
See, all things may possible. It's possible all the oxygen in the room will end up in one corner due to Brownian motion and a slow breeze outside. Unlikely but remotely possible. I don't give it much thought because I KNOW it ain't gonna happen. It's about as likely as this little guy using metal tools. The idea of a creature with a brain 100cc larger than a chimp smelting iron over 4 million years ago is so wildly, outrageously ridiculous that it tell me a lot about the way you think.
Just because you cant think of a way to figure out what an animal looked based on it's bones doesn't mean no one can. I couldn't re-create calculus from nothing on my own.
That doesn't mean no one could.
Oh and by the way, the picture has hair because if the drawing didn't some people would be going "Hey! Where's the hair!?? They were monkeys" and others would be upset at the nasty picture of the naked ugly lady.
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