[daveslash]

I was commenting to my wife the other day... it seems to me that there are very few wild animals that just die from being too old. Not an expert, but it seems to me that most animals in the wild live until they are brutally ripped apart and eaten alive by another animal, and it's only a matter of time -- very rarely reaching an age old enough to just die.

[InitialLastName]

Very few other animals put energy (either directly or through abstractions like "money", "welfare", and "centralized monopolies on the legitimate use of violence") into sustaining members of the species/group that can no longer defend and feed themselves.

Humans in the developed world do this so well that very few of them are even required to defend and feed themselves without these abstractions.

[ANewFormation]

The interesting thing is predator and prey both die when they get too slow. Not sure which side has a worse ending there! Then there's disease or even a simple scratch getting infected.

The world's a brutal place, probably all worlds. Because the very nature of evolution means species that exploit the most thrive the most. The obvious exception of things like a solar feeding plant isn't even an exception. The great oxidation event caused one of the greatest mass extinctions on the planet - we evolved to thrive on oxygen but for most of the other life alive at the time it'd be like if plants today produced cyanide gas.

[ChrisMarshallNY]

Predators tend to have a thinner margin.

Even a slight injury to a predator can mean a slow death by starvation.

That's why videogame predators are so ridiculous. They keep coming after you, even when half their ass is blown away. A real predator will bugger off, as soon as it figures out that there might be a cost to attacking you. That's a big reason that many herbivore defenses seem kind of ridiculous, but work. They just need to make the predator nervous. Unless the predator is starving, it's likely to seek prey elsewhere.

There's also tremendous competition between predators.

[mongol]

I think this is probably right. But does that mean that cancer, cardivascular disease, ALS, Parkinson, etc etc human diseases are incredibly rare among animals?