Kita, or it must be that animal remains are rarer than we think
They are not rare at all. There's typically one carcass per animal. Of course, some animals are swallowed whole while still alive, but once you get above a certain size, that's not really practical.
When we discuss finding a carcass or other remains, a lot depends on the word find. If you mean stumble upon while not actively searching, it makes perfect sense that we don't trip over carcasses.
First, there's the location where the animal dies. If it senses it is dying/impaired, it will usually try to hide. If it's killed by a predator, some predators will drag the carcass to a hiding place.
Second, once other animals discover the carcass, it gets eaten. There's a limited time where the whole thing remains intact. The fleshy bits go quickly. The inedible parts like the large bones may get scattered around.
Third, think about population density. It's estimated that bear habitat supports 1.0 to 2.5 bears per square mile. You know how big a square mile is?
Fourth, it needs to catch your attention for some reason.
So, in order to stumble across a carcass you need to be looking at a place that is probably concealing it *and* actually notice it . You need to do it within a relatively short period of time. You need some luck to be in the right place. And you need to
And yet carcasses are accidentally discovered all the time. It's actually rather mundane.
If you want to
find a carcass by looking for it, it's really not all that difficult, especially if you bring along some dogs.
And yet not BF carcass has been found. It amazes me that you think there's no chance of ET life but that there's a good chance of a BF.