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

Katniss immediately notices that the muttations have a disturbing resemblance to the deceased tributes, particularly their eyes, which reflect a haunting familiarity. Their unnatural combination of human and animal features creates an eerie and unsettling presence. Additionally, their behavior is unnervingly coordinated and aggressive, further highlighting their engineered nature. This blend of human likeness and animal ferocity underscores the Capitol's cruel manipulation of life.