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For what it's worth, their hips and shoulders are actually limited in range of motion compared to humans, due to the very high muscle attachment points that are also what make them so amazingly strong and explosive for their small size. But an extremely flexible spine combined with the ability to dislocate key joints means they can still fit into very small, narrow spaces, presumably an adaptation allowing them to hunt small rodents that burrow and hide out in underground dens. Which I assume is why they have the instinct to immediately jump into and check out any box or cabinet or other enclosed space you open. You never know if there might be some voles in there.
They actually prefer to jump in a box because to them, it's a safe space to hide and watch. Cats look for spaces like that because their wild ancestors (and feral cats now) are small enough that they are both predators and prey.
Yup. Same reason why they like to climb to high places. They can feel safe and survey the surroundings. Additionally, cats will hide in confined spaces when ill or in pain; a sudden desire to hide for prolonged periods is a sign that it needs to see a vet.
I think a lot of oddities we attribute to cats can be explained by the fact that they are both predator and prey. No other animal we spend a lot of time with occupies such a schizophrenic position in the food chain.
I've noticed free-range chickens have some characteristics that derive from a similar position; chickens are not "predators" but they will happily predate if the opportunity arises, and they are also prey. Being birds and natural flock animals, it manifests differently, and there's some interesting behaviors I've noticed.

"Chicken" as a synonym for "total, utter coward" is slander. Yes, running is their first play, but they do not just roll over and die like a sheep or a rabbit; if running isn't working they can and do fight back for all they are worth. And they don't have to be "backed into a corner" and only fight if it's the absolute last option, it just has to be as I phrased it: "running isn't working".

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> actually

I spit my coffee out

> You never know if there might be some voles in there

I like to think I always know if there might be some voles in my boxes and cabinets.

That's just what the voles want you to think.