not just the carcass, but the spark

humans are the moms

compared to other species on earth, humans have a really outsized "protect baby" instinct. you give a human a thing and tell them it's actually a baby thing and many humans will suddenly develop a complete and total aversion to harming it, even if it's like, a writhing mass of slimy tentacles in no way reminiscent of human infants

cats domesticated us by figuring out that they could leave their kittens with us when they went out hunting and come back and probably still have the same number as before they left. there is a decent chance that wolves did the same thing

word gets around the less parenting-inclined species and they're just like, are you doing a long haul space voyage? going to have to lay some eggs in the course of the trip? take a few humans with you. yeah they'll just start training the young and keeping from them climbing into the machinery themselves you don't even have to find specialists. I know a guy who budded unexpectedly on a freight hauler halfway through a four year trip, and not only did the humans not eat his spawn, they set up this thing called "babysitting" where they'd take turns monitoring its survival and helping to teach it basic skills

"Easy. You know how most civilized species lay eggs, and even the ones that don't will have young ones able to move around and fend for themselves within the day?"

"Yeah, obviously."

"Human newborns can't even lift their own heads. They require the full-time attention of as many adults as possible to make sure they survive to a self-sufficient age, much less adulthood."

"Whaaaaat. How long does that take?"

"Many years. And their planet has long years."

"What!"

"Yes. So their parenting instincts are overclocked for a reason. And sometimes that spills over onto other species. ...And by 'sometimes,' I mean all the dang time."

"Uh huh."

"So keep them away from the dangerous fauna, especially the little ones, and be prepared for them to get emotionally attached to the occasional inanimate object. Oh! And if you need to get their attention in a loud room, play a recording of one of their young making a distress sound. They hate that, and will want it to stop immediately."