What attributes does Katniss notice right away about the muttations that distinguishes them as unnatural beings?

Katniss doesn't immediately notice anything *unnatural* about the muttations in *The Hunger Games*. She is horrified by their viciousness and the fact that they are clearly designed to hunt the tributes, but her focus is on survival, not on their origin.

Here's what Katniss observes about the muttations:

* They are incredibly fast and agile: The muttations are described as having "unnatural speed and agility", easily outpacing the tributes.

* They have enhanced senses: Katniss notes their keen hearing and sense of smell, which makes them incredibly difficult to escape.

* They are specifically designed to target the tributes: The muttations are programmed to hunt the tributes, with a particular focus on those with specific skills or weaknesses.

* They are relentless and vicious: The muttations are described as "savage" and "bloodthirsty", with no hesitation in attacking and killing the tributes.

It's not until the end of the Games, when she's talking to Haymitch, that Katniss starts to understand the muttations are something beyond just mutated animals. Haymitch explains that the Capitol "can create them" and that they are part of the Games' sadistic nature.

So, Katniss doesn't specifically notice them as "unnatural" right away. Instead, she's more focused on their horrifying abilities and the danger they pose.