In Ernest Norman's book: "The Truth About Mars". It is stated that pretty much everything was ruined on the surface of Mars. It seems like from Ernest Norman's book that just about all of the oceans we're gone as well as animals with exception of a few that were hiding in caves. In the image below, it might be the creatures that were hiding in caves were walking on the mid sections, the image reveals. The figurines in the middle leave the impression of passing through.
Or it maybe that after the cataclysm hit, the Martians went up from underground and investigated what happened. How many years passed, or what the time period is, I certainly don't know: But here is an excerpt from the book: http://www.firedocs.com/remoteviewing/mars/mars.html
You can do a search in Ernest book by putting in a key word in the search bar that is in a blue background. It is very surprising to me how many of the sculptures on Mars that Curiosity takes photos of seem to back up Ernest book: The Truth About Mars. Which makes me realize that he must of really had a telepathic communication with this "Nur El", a leader from Mars. In which they live underground and many sculptures leave the impression of that very fact!
If they currently didn't live underground. I don't think you would be seeing the intelligently made sculptures that seem like dedicated memorials to creatures like we do! And if you study these images, you know for a fact that "fish forms" are practically everywhere, though they may be very subtle like in the image below and to the left of the image!
The analysis I use for the photos and imagery are not mean't to be exacting, only to get you closer to understanding that there is intelligent life on mars (martians). Many of the rocks you may think are rocks, are in fact highly designed sculptures, mechanical objects etc.
Nasa is trying to leak out anomalous imagery with out of course talking about it public! Though most images have been doctored, Nasa is trying to humbly and quietly nudge us along with out going too public about it vocally. Though it is work and painstaking effort to find objects in the images that have not been altered in some way!