The Sunspire why do piranha plant have bone in it?

oh boy! backstory!

uh- he finds himself in a place that he hadn't ventured to in...ever. hazy memories of being smaller float to his mind, being wrapped in blankets with a bottle of something shoved into his mouth, feeling milk-but-not-milk foaming at his lips. lights shining on his face all the while. voices — two-legged voices, with all of those strange tones and inflections, coos and laughter; they were very very complicated. as he thinks about it, the more his mind goes fuzzy. he's squinting with the concentration of trying to remember someone, but can't find anyone, not a two-leg face or a cat face, not until his owner. and he was older then, not a baby, no longer drinking milk-but-not-milk. mmmmdunno? he eventually says, fleeing the recesses of his mind. he hated thinking hard. i had a....an owner tho. til they....uh... til they left me. he knows what happened. he doesn't know why. what'd he do wrong? he hadn't been bad since he was little. he wasn't able to sit on their lap like he used to, but he was still getting scritches and pets. he never hurt no body. not on purpose. i just kinda...kinda woke up here? not, uhh...not here here. he looks around. where'd he come from? down there? he looks west.