Fascinating!

https://youtu.be/SMBhUPzVJZw?si=_GpPQYxkrhhg-XdH

In fact, according to one interesting theory there might have been an eighth time: us.

Just look at the skin, between the base of our thumbs and forefinger; doesn't it look suspiciously like it's an evolutionary remnant of something, that would have resembled webbed skin? Perhaps, at the road from Australopythecus to Homo, there was a marine stage, which might have lasted a few hundreds thousands of years, approximately 3.5 million years ago or so. And perhaps this was when our genus had lost most of its fur, too.