Sometimes when people say that a speculative creature is too far fetched to be "realistic" you just have to remind them that we have, in this very timeline, an extant dinosaur that evolved to fill the ecological niche of a bee.

*insert B. rex joke pun here*

Little late on the follow up but I just want to add that nature, in itself, seems unnatural/is incredibly unusual.

Relating to biology alone:

90% of giraffe sex is gay, there are bacteria that eat electricity, like 1% of the content in a coelacanth’s braincase is actually its brain, the hummingbird thing, ostriches think humans are more attractive than other ostriches, insects fly using modified gills, cetaceans exist, there are functionally immortal Cnidarians, fungi, some plants purposely entice animals to eat certain parts of them, there are bugs with gears for legs, “worms” so saturated in stem cells that they can be cut into several pieces and grow into more worms, marine worms with bodies that branch like plants, parasitic crustaceans, etc…

The list could go on.

There's a snail that's a parasite in sea cucumbers and it looks like a snail until it finds a host and then it metamorphoses into just a ribbon of reproductive tissue exactly like a tapeworm :)