Note: You cannot do this until you've unlocked the "Anubee" achievement
In the National Museum of Natural History on the lower rotunda level on the right side of the curved hallway there in an exhibit of Trilobites (seen in the achievement pic). Use Animal Power on the exhibit to activate it. The goal is to get each of the four coloured trilobites (Yellow, Blue, Green, Red) in their correct coloured hole with their head facing the same way as he thole is shaped. Press
to select/unselect a trilobite and the
to guide them along the path.
Start with Yellow and move it up so it's next to the lower triangle. Move Blue into the blue spot, it will sink in when he's properly aligned. Move Yellow to the left of the upper triangle. Move Green around the shell on the left, up past the lower triangle, up past the upper triangle, and around to its green spot. It will sink in when it's properly aligned.
Move Yellow all the way around the outer circle past green and red spots, turn down by the upper triangle into its yellow spot and it will sink in. Move Red all the way around the outer circle past blue spot, turn down by the upper triangle, past the lower triangle, and follow the outer circle past the green spot to its red spot. When it sinks in the achievement will unlock.