#os stuff

So, the skeletons look like this, and their jaws are able to unhinge in order to eat larger prey if they want. All mers are carnivores, so they all have sharp teeth

And specific mers, like the larger DCA ones, grow another pair of arms as they get older. When that happens, one of the bones on their spine has a hinge on it developed after hatching, and that helps the new bones grow and be mobile

Their digestive systems are pretty basic as well, with no intestines after their stomachs, because their acid is strong enough to digest anything, and that includes bones

They also have two stomachs! One is for kinda storing food for later, like if they know they dont want to hunt later, they can still eat the prey and not have to worry about hoarding the food somewhere where other preditors can easily steal it

Their second one is for digestion, which I dont really have to explain because it works just like any other living things' stomach, the acid is just stronger

The mers have an ability to eat anything that they want, even if its poisonous or has venom they can eat it because they are immune to it