so in halo ODST at the ending mission you can see buck trying to pet a odd looking monkeyman? apparently you can also find a family of them in halo 3 :
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Halo 3 Easter egg: Weird floating man on boxers - YouTube
My Favorite Video Game Easter Eggs
Heading to his Destiny achievement in Halo MCC
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Halo 3 Easter egg of co founder Jason Jones guys remember this Easter egg?? : r/halo
Heading to his Destiny achievement in Halo MCC
Halo 3: Easter Eggs Episode-1 The Cavemen - YouTube