Simulacra

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The autopsy of the Silly Putty man.

Simulacra are a humanoid xenos species with slender, pink, fleshy bodies, bulbous forearms and lower legs, and a pointed, featureless head. Simulacra can take on the form of another being for a limited time after consuming that creature's brain. This effect allows them to behave as that individual for the duration of their transformation, knowing everything their prey knew. They're essentially doppelgangers IN SPACE!!!

Notable Species of Warhammer 40,000
Major species of the galaxy:	Abhumans - Eldar - Dark Eldar - Humans - Necrons - Orks - Tau - Tyranids
Minor species of the galaxy:	Araklionid - Barghesi - Banelings - Bale Childers - Drahendra - Caradochians Cimmeriac - Cryptos - Cythor Fiends - Demiurg - Donarathi - Drugh - Dracoliths Drax - Enoulian - Enslavers - Fra'al - Galg - Gykon - Hrud - Jokaero - Jorgall K'nib - Kathaps - Khrave - Kinebrach - Kroot - L'Huraxi - Lacrymole - Laer - Lelith Loxatl - Medusae - Megarachnids - Nekulli - Nicassar - Old Ones - Q'Orl - Rak'gol Reek - Reptos - Saharduin - Saruthi - Scythian - Simulacra - Slann - Slaugth - Sslyth Stryxis - Tarellian - Thexian - Thraxian - Thyrrus - Tushepta - Umbra - Ur-Ghul Vespid - Watchers in the Dark - Whishperers - Xenarch - Yu'Vath - Zoats - Ambull